(iii) 5.0, 25.0, 50.0 and 100.0 g aliquots of MgCl2 were dissolved in 4 separate 250 ml samples of distilled water. Calculate [H30*] and the pH for each of the resulting solutions and comment on the relationship between [MgCl2] and pH.
Q: If you needed to perform a reaction in a controlled pH environment that was fairly basic, you might…
A:
Q: A mixture containing only KCl and NaBr is analyzed by the Mohr method. A 0.3172-g sample is…
A: Concentration: It is the ratio of number of moles of solute dissolved in per litre of solution.
Q: Explain why colour of KMnO4 disappears when oxalic acid is added to its solution in acidic medium.
A: The progress of different acid base reactions can be checked with the help of acid-base indicators.…
Q: The surface water of a lake is at pH = 7.9 and contains 10-29 M dissolved inorganic carbon (i.e.,…
A: We’ll answer the first question since the exact one wasn’t specified. Please submit a new question…
Q: A solution was prepared by adding 4.95 g sodium acetate (NaC2H3O2) to 250.0 mL of 0.150 M. acetic…
A:
Q: What volume of 0.100 M MgCl2 must be diluted to exactly one liter in order to prepare a solution…
A: The concentration of the concentrated MgCl2 solution = 0.100 M The ionic strength of the required…
Q: Write the charge balance for a solution of lead(II) iodide containing the species Pb2, I, PbI,…
A: Pb represents lead which is a metal. It can show a valency of maximum 2.
Q: Show by calculation how could you prepare 250 ml of 0.1N Na,CO; from the solid primar standard of…
A:
Q: Use the systematic treatment to get the concentrations of all the species in a solution of: a.)…
A:
Q: s it possible, upon precipitation of the third class ions, to add H2S first, then NH4OH and NH4Cl?…
A: QUALITATIVE ANALYSIS: The qualitative analysis of the metals or ions is used to detect the presence…
Q: a.) What is the precipitation pH in gravimetric sulfate determination? Why is precipitation not done…
A: a) Sulfate is gravimetrically determined by using barium chloride solution.
Q: The dissociation vapor pressure of a salt A2B(s) ⇌ A2(g) + B(g) at 367°C is 208 kPa but at 477°C it…
A:
Q: Calculate the activity coefficient of K* in 0.050 M KNO3.
A: Given: 0.050M KNO3 To find: activity coefficient of K+.
Q: The precipitation of Al1OH23 1Ksp = 1.3 * 10-332 is sometimes used to purify water. (a) Estimate the…
A: Given: Ksp of Al(OH)3 = 1.3 x 10-33 Volume of water = 2000 gal Volume of Al2(SO4)3…
Q: The landfill manager suggested using H2CO3 with Na2CO3 as a buffer to minimize pH changes. Do you…
A:
Q: Chrome then curiously asked Senku if it was possible to titrate the pure KHA. H2A2H;O sample through…
A:
Q: The pH and Kh of 0.1N NH4CI solution, if Kb for NH4OH at 25°C is 1.8x10-5 will be respectively equal…
A: pKb = - log Kb = - log ( 1.8 x 10-5) = 5 - 0.26 = 4.74 C = 0.1 N For salt NH4Cl pH = 0.5 (pKw - pKb…
Q: A 5.55-g sample of a weak acid with Ka = 1.3 * 10 - 4 was combined with 5.00 mL of 6.00 M NaOH, and…
A: The general reaction between NaOH and diprotic acid is as follows, Calculate the moles of sodium…
Q: Create the flowchart of qualititative analysis of Cations in Group 2 and explain.
A: Group II (Cu2+, Bi3+, Cd2+, Hg2+, As3+, Sb3+, Sn4+) cations produce very insoluble sulfides (Ksp…
Q: What is the pH of the saturated solution of iron(II) hydroxide at about 98° С: = 5.0x10-13 KsP…
A:
Q: Why is it possible to use K2S instead of thioacetamide in precipitating the Group II and Group III…
A: Thioacetamide is widely used in classical qualitative inorganic analysis as an in situ source for…
Q: Write the relevant chemical reaction and mass-balance expression for 0.1 M NaCl and 0.1 M NaH2PO4.
A: Sodium Dihydrogen Phosphate + Sodium Chloride = Nahpoite + Hydrogen Chloride 0.1 M of aqueous Sodium…
Q: Using the concentrations 0.100M and 0.1766M, and the pKa of 3.752, what is the theoretical pH of a…
A: pKa = 3.752
Q: The solubility of CO2(g) in water at 25 °C and under a pressure of 1.00 atm is 1.45 g/L. If the air…
A: Air pressure is 1.00 atm. Pressure of CO2 in air =0.036100×1.00 atm=3.6×10-4 atm
Q: Calculate the pH at which pilocarpine (basic drug) starts to precipitate from a 2% w/v aqueous…
A: Solution- poOH=pKb + logConjugated acidbasegivehn pKa of pilocarpine…
Q: For water having a total alkalinity of 1.00x10^-3 mol/L and a pH of 10.34 what is the percentage…
A: Given: Total alkalinity of water = 1.00 × 10-3 mol/L pH = 10.34
Q: Why is sodium oxalate the primary standard for the determination of concentration of KMnO4 solution?
A: Primary standard is the chemical compound which is used in the determination of amount or…
Q: What is the pH of the solution after mixing 0.188 g of Mg(OH)2 (MW=58.321 g/mol) with 18.1 mL of…
A: Given, Mass of Mg(OH)2 = 0.188 g Molar mass of Mg(OH)2 = 58.321 g/mole Volume of HCl = 18.1 mL…
Q: An alkaline sample of sodium compounds weighing 1.196 g was dissolved in water, cooled at 15 deg C,…
A: Alkaline compounds of sodium may involve sodium hydroxide (NaOH), sodium bicarbonate (NaHCO3) and…
Q: What is the ionic strength of 0.10 M ZnSO4?
A: A chemical compound consists of two or more different elements which are bonded with each other…
Q: Calculate the activity coefficient of K+ in 0.050 M KNO3.
A:
Q: If a sample of silver coin weighing 0.2500 g gives a precipitate of AgCl weighing 0.2991 g, What wt…
A: The given data contains, weight of silver coin = 0.2500 g. weight of AgCl= 0.2991 g.
Q: Explain how you would analyse Fe(OX).2H2O for iron and oxalate if you were provided with a…
A: FeC2O4.2H2O has Fe2+(aq) as the cation and oxalate ion, C2O42-(aq) as the anion.
Q: 3. The maximum buffering capacity is nearest to the pka of the buffer. Explain why?
A:
Q: 50 cm3 of 0.05 M weak acid solution is titrated with 0.1 M NaOH solution. The measured pH values are…
A: Given: Volume of weak acid = 50 cm3 Concentration of weak acid = 0.05 M Concentration of NaOH = 0.1…
Q: Calculate the equilibrium concentration of N2O4 in 1.00 L of a solution prepared from 0.129 mol of…
A: The Equilibrium constant is defined as the ratio of the molar concentrations of the products and…
Q: A dried sample of commercial salt was prepared by a coning and quartering. A 0.911-g sample of the…
A: NaCl (aq) + AgNO3(aq) -----> AgCl(s) + NaNO3(aq) 1 mole AgNO3(silver nitrate) neutralizes 1 mole…
Q: The level of dissolved oxygen in a water sample can be determined by the Winkler method. In a…
A:
Q: Sodium acetate, CH3COONa was hydrolysed in water, H2O. Show the reaction equations involved. What is…
A: Sodium acetate hydrolysis in water and formed acid and base.
Q: Calculate the pH of: A 0.0850 molar solution of the intermediate (HA) form of threonine. It is…
A: Given, 0.0850 molar threonine compounds The pOH of the solution is calculated as follows,
Q: n alkaline sample of sodium compounds weighing 1.196 g was dissolved in water, cooled to 15°C,…
A: Given: Mass of alkaline sample of sodium compounds= 1.196 g Normality of H2SO4= 1.058 N The volume…
Q: Consider the titration of 25.00 cm3 of 0.10 M CH3COOH(aq) with 0.20 M NaOH(aq) at 25 °C. Calculate…
A: The concept here is the titration of weak acid v/s strong base. 1 cm3 = 1 ml
Q: A lake has a pH of 6.35 and a measured alkalinity of 5.0 x 10-3 eq/l. What is the concentration of…
A:
Q: If 4.381 g of sodium dihydrogenphosphate and 5.207 g of disodium hydrogenphosphate are dissolved in…
A: Given : Mass of sodium dihydrogenphosphate i.e NaH2PO4 = 4.381 g Mass of disodium hydrogenphosphate…
Q: Calculate the activity of the bromide ion in a solution that is 0.050M KBr, 0.050M NaBr, and 0.050M…
A:
Q: A sample of water in contact with solid Fe(OH)3 is found to have a pH of 7 .5. If no other dissolved…
A: To calculate the pOH of the solution, the equation used is: pH + pOH = 14 ........(1) pOH is…
Q: How to qualitatively search for NO3- and NO2- in the presence of Br- anion? Explain with reaction…
A: Since you have asked multiple questions, we will solve the first question for you. If you want any…
Step by step
Solved in 6 steps
- During the course of the titration of a 20.0 ml of solution containing 0.1 M of NaOH and 0.08 M of hydrazine (NH2-NH2) (Ka = 1.05 x 10) by a 0.2 M standard perchloric acid (HC104) titrant, calculate the pH of the titration mixture after (a) 5.0 ml; (b) 10.0 ml; and (c) 15.0 ml of HC1O4 titrant is added.a) What mass of Fe(NH4)2(SO4)2•2H2O(s) is required to prepare a 500 mL solution containing 100 ppm (m:v) in Fe? b) Using this stock solution, what aliquot must be used to prepare calibration solutions, 100 mL volume, of the following concentrations: 0.100 ppm, 0.500 ppm, 2.00 ppm, 4.00 ppm, and 7.00 ppm.An alkaline sample of sodium compounds weighing 1.196 g was dissolved in water, cooled to 15°C, treated with 2 drops of Pp indicator and titrated with 1.058 N H2SO4 requiring 6.8 ml to render the solution colorless. Upon adding 2 drops of MO and continuing the titration, 16.5 ml more of the acid were needed to complete the analysis. What is the quantitative composition of the sample? MW: NaOH = 40.0, Na2CO3 = 106.0, NaHCO3 = 84.01
- A biochemical reaction takes place in a 1.00 ml solution of 0.0250 Mphosphate buffer initially at pH = 7.20 (as shown for pKas of phosphatespecies).(a) Are the concentrations of any of the four possible phosphate speciesnegligible? If so, identify them and explain your answer.(b) During the reaction, 3.80 μmol of HCl are produced. Calculate the finalpH of the reaction solution. Assume that the HCl is completely neutralizedby the buffer.A sample of 0.10 M CH3COOH(aq) of volume 25.0 cm3 is titrated with 0.10 M NaOH(aq). The Ka for CH3COOH is 1.8 x 10-5. (a) What is the pH of 0.10 M CH3COOH(aq)? (b) What is the pH after the addition of 10.0 cm3 of 0.10 MNaOH(aq)? (c) What volume of 0.10 M NaOH(aq) is required to reach halfway to the stoichiometric point? (d) Calculate the pH at that halfway point. (e) What volume of 0.10 M NaOH(aq) is required to reach the stoichiometric point? (f) Calculate the pH at the stoichiometric point.2.413 g sample contains Na2CO3, NaHCO3 and inert material. This sample was solved in water and diluted to 250.0 ml. 80 ml solution was taken and titrated with 0.09644 N HCl with the indicator of phenolftalein. 6.13 ml HCl was consumed. From a second solution, again 80 ml was taken and titrated with the same HCl solution with the indicator of methylorange. 15.4 ml HCl was consumed. Calculate the percentage of NaHCO3 and Na2CO3in sample (Na2CO3=106.0 g/mol, NaHCO3=84.02 g/mol).
- 2.413 g sample contains Na2CO3, NaHCO3 and inert material. This sample was solved in water and diluted to 250.0 ml. 80 ml solution was taken and titrated with 0.09644 N HCl with the indicator of phenolftalein. 6.13 ml HCl was consumed. From a second solution, again 80 ml was taken and titrated with the same HCl solution with the indicator of methylorange. 15.4 ml HCl was consumed. Calculate the percentage of NaHCO3 and Na CO in sample (Na CO =106.0 g/mol, NaHCO =84.02 g/mol)(a) Sodium acetate, CH3COONA was hydrolysed in water, H2O. Show the reaction equations involved. What is the effect of the salt on the pH of this solution? (b) (i) Define buffer solution. (ii) 2.50 g of sodium acetate, CH3COONA was dissolved in 150.0 mL of water, H2O. A solution of 0.025 M ethanoic acid, CH3COOH was added into the above salt solution. Calculate the pH of the mixed solution. [pKa of CH3COOH = 4.75, Molar mass of CH3COONA = 82.0 g mol-1] (c) Explain how the above buffer solution maintain its pH when a small amount of sodium hydroxide, NaOH is added.(4) The amount of oxalic acid in a sample of 3+ rhubarb was determined by reacting with Fe as outlined in the following reaction. In a typical analysis, the oxalic acid in 10.62 g of rhubarb was extracted with a suitable solvent. The complete oxidation of the oxalic acid to 3+ CO, required 36.44 mL of 0.013 M Fe*.What is the weight percent of oxalic acid in the sample of rhubarb? 2FE3" (aq) + H2C,O,(aq) + 2H2O(1) → 2Fe?* (aq) + 2C02(g) + 2H;0 (aq)
- The phosphate in a 3.000-g sample of industrial detergent was precipitated by the addition of 1.000 g of AgNO3. The solution was filtered and filtrate, upon addition of 1.00 mL of 0.01 M fecl3, required 18.23 mL of 0.1377 M KSCN for titration to the end point. (a) the weight percent of phosphate in the detergent(iv) The Ksp for zinc oxide is 3.5 x 1017. What concentration of zinc sulfate (in mol/L) must be dissolved in water in contact with solid zinc oxide to obtain a solution pH of 5.9?.Write the balance equation of aqueous Pb(ClO3)2 with NaI. Include phases.