A certain liquid X has a normal boiling point of 97.40 °C and a boiling point elevation constant K 1.13 °C-kg-mol = kg.mol-1. Calculate the boiling point of a solution made of 45.g of ammonium chloride (NH4Cl) dissolved in 450. g of X. Round you answer to 4 significant digits. °C x10 ☐ X 5
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- At a pH of 7.40, the carbonic acid ratio is ________. a. 35:1 b. 4:1 c. 20:1 d. 3:1A buffer contains 0.015 mol of lactic acid (pK₁ = 3.86) and 0.080 mol of sodium lactate per liter. H₂C OH Lactic acid OH Calculate the pH of the buffer. H₂C. Calculate the change in pH after adding 9.0 mL of 0.10 M HCl to 1.0 L of the buffer. O OH Sodium lactate Calculate the change in pH after adding 9.0 mL of 0.10 M HCl to 1.0 L of pure water. O Na+ buffer pH: buffer pH change: water pH change: units units75 g of impure sodium hydroxide is added to 250 cm3 of water. 10 cm3 of this impure solution is neutralized by 13,5 cm3 of HNO3concentration 0,2 mol.dm–3.Calculate the percentage purity of the sodium hydroxide.
- You just made a 1.5M permanganate solution. What concentration is your potassium permanganate solution in percent? "K: 39.10 g/mole" "Mn: 54.94 g/mole" "O: 16 g/mole" "MW of KMnO4 is 158.04 g/mole" O a. 0.24% Ob. 20.1% O c. 15.8% O d. 23.7% O e. 2%A sample of steel weighing 2.00 g is analyzed for Cr (AW 52.0). The Cr is oxidized into chromate with alkaline permanganate and the excess permanganate is destroyed. A certain volume of 0.120 M FeSO4 is added to the acid solution and the excess is titrated with 0.0220 M KMnO4, requiring 31.0 mL. If the sample contained 0.50 % Cr, what volume (in mL) of FeSO4 was added?Rank the following aqueous solutions in order of increasing vapor pressure. You do not need to show work for this question. A 0.03m sugar (C,H120J B. 0.03 m NaCl C.0.03m Mg(NO3)2 Lowest Vapor Pressure Select] v < [Select] |Select] * Highest Vapor Pressure
- Benzoic Acid Champi Sample Weight of sample 0.4997 g 0.4107 g Pressure in the container 3000 kPa 3000 kPa Measured heat of combustion 26.28 kJ/g or 6.281 kcal/g 11.74 kJ/g or 2.806 kcal/g 1. Calculate the calorific value of the sample in KJ, kcal and cal units.An antacid tablet (such as Tums or Rolaids) weighs 1.3259 g. The only acid-neutralizing ingredient in this brand of antacid is CaCO3. When placed in 12.07 mL of 1.070 M HCl, the tablet fizzes merrily as CO2(g) is givenoff. After all of the CO2 has left the solution, an indicator is added, followed by 11.74 mL of 0.5310 M NaOH. The indicator shows that at this point the solution is definitely basic. Addition of 5.12 mL of 1.070 M HCl makes thesolution acidic again. Then 3.17 mL of the 0.5310 M NaOH brings the titration exactly to an endpoint, as signaled by the indicator. Compute the percentage by mass of CaCO3 in the tablet.The pH of a 1.25 x10-3 M NaOH solution is: a 7 2,90 3.10 d 11.10 O e 10.90
- An aqueous solution contains 0.34 M potassium cyanide. One liter of this solution could be converted into a buffer by the addition of: (Assume that the volume remains constant as each substance is added.) 0.34 mol HCI04 0.16 mol NaOH 0.33 mol KCIO4 0.16 mol HCIO4 0.33 mol HCNEstimate the pH of a 7.18 x 106 M HF solution. You can calculate the lowest possible pH, knowing that the actual value will be higher. Your answer should contain 3 decimal places as this corresponds to 3 significant figures when dealing with logs. pH will be above Select the solution with the highest pH. Multiple Choice 0.0225 MLIOH 0.0225 MH2CO3 0.0225 MCH3NH2What mass of sodium glycolate (NaC2H3O3) should be added to 400.0 mL of 1.00 M glycolic acid to produce a buffer solution with a pH of 4.00? Ka = 1.47 x 10-4. Please indicate the full solutions.