SCH4U UNIT 4 Assignment Acid and Base Equilibrium
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SCH4U UNIT 4 Assignment
AIA-JAN-2022
Acid and Base Equilibrium (4%)
1. For the chemical reaction: [1 K]
2 SO2 (g) + O2 (g) 2 SO3 (g) ΔH= -92.6 kJ.
Which condition favours maximum conversion of the reactants to products?
a. high pressure and high temperature
b. high pressure and low temperature
c. low pressure and low temperature
d. low pressure and high temperature
e. adding a catalyst
2. For the chemical reaction, complete the following chart by writing left, right or none for the equilibrium shift, and decreases, increases or remains the same for the concentration NaOH(s) Na + (aq) + OH - (aq) + energy [6-K/T/C]
3. Find the pH of a solution formed by dissolving 0.100 mol of HC2 H3 O2 with a Ka of 1.8x10-8 and 0.200 mol of NaC2 H3 O2 in a total volume of 1.00 L. [3-A/T/C]
4. Determine the pH of a 0.010 M solution of: [3-A/T/C] a.NaOH b.Ba(OH)2 . C. HCl
5. Sketch a titration curve for the following situations: [8-K/T/A/C]
a. Strong acid- strong base
b. Weak acid – strong base
c. Strong acid – weak base
d. Polyprotic acid
6. Calculate the pH of the solution formed when 55.0 mL of 0.25 mol/L Ba(OH)2 is added to 25.0 mL of 0.40 mol/L of HI. (hint: balance equation – not a 1:1 ratio) [4-A/T/C]
7. Calculate the pH at equivalence point in the titration of 50.0 mL of 0.1 mol/L CH3 COOH with 0.1 mol/L NaOH. [3-A/T/C]
8. Calculate the pH at the equivalence point when 40.0 mL of 0.025 mol/L benzoic acid, C6 H5 COOH (ka = 6.3 x 10 -5 ) is titrated with 0.050 mol/L NaOH. [4-A/T/C]
9. What is the concentration of unknown NaOH when 42.4 mL of NaOH is required to titrate 40.0 mL of 0.09 mol/L HNO3 to the equivalence point? [4-A/T/C]
10. A student titrates a 20.0 mL sample of 0.30 mol/L of HCl with 0.25 mol/L solution of NaOH solution. Calculate the pH: [8-A/T/C]
a. before the standard NaOH is added
b. between the start and equivalence point (let’s say that 8.0 mL of NaOH has been added)
c. at equivalence point. How much NaOH needs to be added to reach equivalence point?
d. after the equivalence point (let’s say 28.0 mL of NaOH has been added to the HCl
2023-02-11