Calculate the pH of the following buffer solutions: (a) a solution made by dissolving 2.733 g KH2PO4 and 4.508 g K2HPO4 in water to give 250. mL of solution. Stepwise acid dissociation constants for phosphoric acid may be found in your textbook. (b) a solution made by mixing 35.00 mL 0.24 M C6H5NH2  with 15.00 mL 0.19 M C6H5NH3Cl. The base dissociation constant Kb is 4.00 x 10^-10 for C6H5NH2. Assume that the final volume is the sum of the volumes of the two solutions that are mixed.

Q: Calculate the mass of sodium acetate (CH3COONa) required to prepare 35 mL of a 0.15 M sodium acetate…

A: Given data: Sodium acetate concentration = 0.15 M Volume = 35 mL Molar mass of sodium acetate =…

Q: The pH of a solution made by mixing 50.0 mL of 0.13 molar B, a weak base, with 20.0 mL of 0.19 M HCl…

A: The pOH of a solution by mixing weak base and HCl is calculated as,

Q: A1 liter solution is made by adding 0.8603 moles NaH2PO4 and 0.4973 moles Na2HPO4. What will be the…

A: Given, NaH2PO4 = 0.8603 mol Na2HPO4 = 0.4973 mol [HCl] = 6.0287 M VHCl = 1.5857 mL = 0.0015857 L

Q: Calculate the pH of a buffer solution prepared by dissolving 0.25 mol benzoic acid (CH,COOH) and…

A:

Q: The K, of hydroxylamine, NH,OH, is 1.10 x 108. A buffer solution is prepared by mixing 100.0 mL of a…

A: A buffer solution is a mixture of a weak acid and its conjugate base or a weak base and its…

Q: Addition of phenolphthalein to an unknown colorlesssolution does not cause a color change. The…

A: a) Given :Addition of phenolphthalein: No color change               addition of bromthymol blue:…

Q: Phosphoric acid is a triprotic acid with the p?a values p?a1=2.148, p?a2=7.198, and p?a3=12.375.…

A: Ionization of phosphoric acid is,

Q: You are asked to prepare a pH = 3.00 buffer solution startingfrom 1.25 L of a 1.00 M solution of…

A: (a) Given: Concentration of HF – 1.00 M pH of the buffer solution = 3.00 Volume of solution = 1.25 L…

Q: How many moles of sodium hydroxide would have to be added to 225 mL of a 0.404 M nitrous acid…

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Q: 100 mL of a natural water sample, whose pH is 6,6, requires 12,2 mL of 0,10 M HCl to end point…

A:

Q: In titrating 40.0 mL of 0.10M of HCI solution with 0.15 M of KOH solution, what would be the pH of…

A: Given that ,  HCl (acid) KOH (base) Molarity(Ma) = 0.10 M Molarity (Mb) = 0.15 M Volume (Va)…

Q: If a buffer solution is 0.260 M in a weak base (Kb=8.4×10−5) and 0.480M in its conjugate acid, what…

A:

Q: An aqueous solution contains 0.494 M ethylamine (C2H5NH2). How many mL of 0.206 M hydroiodic acid…

A: Given data,Molarity of ethylamine=0.494MMolarity of HI=0.206MVolume of buffer=225mL=0.225LpH=10.6…

Q: A solution of nitric acid, HNO2, at a concentration of 0.495M was found to be 1.83 = pH.

A:

Q: A buffer solution contains 0.345 M NaHSO3 and 0.430 M Na,SO3. If 0.0273 moles of perchloric acid are…

A: We will use buffer equation

Q: How many grams of solid ammonium chloride should be added to 0.500 Lof a 0.239 M ammonia solution to…

A: The given information is: Volume of the solution = 0.5 L Concentration of the solution = 0.239 M pH…

Q: A 1 liter solution is made by adding 0.5844 moles NaH2PO4 and 0.5116 moles Na2HPO4. What will be the…

A: A 1 liter solution is made by adding 0.5844 moles NaH2PO4 and 0.5116 moles Na2HPO4. What will be the…

Q: For biological buffer systems, buffer acids capacity is usually greater than buffer bases capacity.…

A: A biological buffer is an organic substance in our body that helps in maintaining the body at the…

Q: You have at your disposal an ample quantity of a solutionof 0.100 M HCl and 400 mL of a solution of…

A: Given: Concentration of HCl = 0.100 M Volume of NaCN solution = 400 mL = 0.400 L…

Q: An aqueous solution contains 0.396 M ethylamine (C2H5NH2). How many mL of 0.268 M perchloric acid…

A:

Q: The value of Ka for acetic acid is 1.75 × 10—5. The pH of a 0.100 M solution of acetic acid is:

A:

Q: A 4.50-g quantity of a diprotic acid was dissolved in water and made up to exactly 225 mL. Calculate…

A: Given : Mass of acid = 4.50 g Volume of solution made = 225 mL = 0.225 L…

Q: To a 50 mL of 0.1 M HCL solution, 10 mL of 0.1 M NaOH is added and the resulting solution is diluted…

A:

Q: An aqueous solution contains 0.329 M methylamine (CH3NH2). How many mL of 0.305 M perchloric acid…

A:

Q: The pH of the solution obtained when 1.00 g of NaOH solid is added to 500 mL of 0.100 M HC2H3O2…

A:

Q: A solution is prepared that is initially 0.17 M in trimethylamine ((CH,),N), a weak base, and 0.20 M…

A:

Q: A buffer solution contains 0.254 M NaHSO3 and 0.348 M Na2SO3. If 0.0285 moles of hydroiodic acid are…

A: A buffer resists a considerable change in pH when a small amount of acid or base is added to it. The…

Q: An aqueous solution contains 0.484 M methylamine (CH3NH2). How many mL of 0.388 M perchloric acid…

A:

Q: A mixture of0 12 M NH C1 and 0.246 M NH40H has volume of 20 mL, calculate its Ph volume 1 ml of 1 M…

A: Here we have to determine the change in pH by addition of small quantity of strong acid HCl and…

Q: A buffer was prepared by mixing 1.00 mole of ammonia and 1.00 mole of ammonium chloride to form an…

A:

Q: A buffer solution contains 0.289 M KH2PO4 and 0.399 M K2HPO4. If 0.0485 moles of hydroiodic acid…

A: To calculate the pH of the resulting solution when 0.0485 moles of hydroiodic acid are added to 250…

Q: A solution is prepared by mixing 80 mL of 0.2 M KH2PO4 and 120 mL of 0.2 M K2HPO4 . What is its pH?

A: Moles of KH2PO4 ( acid), = 0.2 M × 0.08 L = 0.016 mol   Moles of K2HPO4 (base), = 0.2 M × 0.120 L =…

Q: You are asked to prepare a buffer solution with a pH of 3.50. The following solutions, all 0.100 M,…

A: The available acids and their conjugate bases are: HCOOH, pKa = 3.745 CH3COOH, pKa = 4.75 H3PO4, pKa…

Q: A buffer solution contains 0.254 M NaHSO3 and 0.348 M Na2SO3. If 0.0285 moles of hydroiodic acid are…

A: Calculate the initial pH of the given buffer solution using Henderson-Hasselbalch equation,

Q: If you have 500 mL of a 0.10 M solution of the acid, what mass of the corresponding sodium salt of…

A:

Q: One characteristic of blood that we rarely give a thought to is its pH. The pH of blood must be held…

A: Buffer is a solution that resists the change in its pH when small amount of acid or base is added to…

Q: a) Calculate the pH of a buffer solution made by combining 3.S09g of NaOAc •3H,0 (Sodium Acstehe

A: Given: Mass of NaOAc.3H2O = 3.509 g Volume of HOAc =8.8 mL Volume of water added= 55.6 mL

Q: Your facilitator asked you to prepare 450-mL of a buffer solution having a pH of 10.45 composed of…

A: The Answer to the following question is-

Q: You have been observing an insect that defends itself from enemies by secreting a caustic liquid.…

A: The relation given by Henderson Hasselbalch for calculating the pH of the weak acid solution is…

Q: Codeine, C18H26O3N is the active ingredient in the sedative Paregoric™ and is a weak Brønsted base…

A: A solution involving weak alkali with conjugate salt is addressed as "alkaline buffer solution". On…

Q: Polymers are not very soluble in water, but their solubility increases if they have charged groups.…

A: Casein is the type of protein that is found in skim milk and coagulated at a certain pH. It is one…

Q: A student prepares an 750.0 mL buffer solution with a pH of 4.85 by adding sodium acetate to a…

A: The buffer containing acetic acid (a weak acid) and sodium acetate (salt of acetic acid with NaOH)…

Q: What is the pH of a buffer solution that is 0.33 M propionic acid and 0.55 M sodium propionate?

A: Given: Concentration of propionic acid  = [C₃H₆O₂] = 0.33 M Concentration of sodium propionate =…

Q: The pH of a solution prepared by mixing 50.0 mL of 0.125 M NaOH and 30.0 mL of 0.125 M HNO3 is…

A:

Q: A 1 liter solution is made by adding 0.4976 moles NaH2PO4 and 0.2000 moles Na2HPO4. What will be the…

A:

Q: Phosphoric acid is a triprotic acid with the pKa values pKa1=2.148, pKa2=7.198, and pKa3=12.375.…

A: Phosphate buffer is having high buffering capacity and it is made according to the pH requirement.…

Q: How many moles of sodium hydroxide would have to be added to 225 mL of a 0.332 M hydrocyanic acid…

A:

Q: sodium dihydrogen phosphate monohydrate, ?a=6.23×10−8, 2.00 M disodium hydrogen phosphate…

A: The acid given is sodium dihydrogen phosphate monohydrate i.e. NaH2PO4·H2O. And the conjugate base…

Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.