1) Finish the Sentence: When solid lithium hypochlorite is added to water, the p

ID: 955871 • Letter: 1

Question

1) Finish the Sentence: When solid lithium hypochlorite is added to water, the pH _____

a. remains at 7

b. becomes greater than 7 because of hydrolysis of lithium ion

c. becomes less than 7 because of hydrolysis of lithium ion

d. becomes greater than 7 because of hydrolysis of hypochlorite ion

e. becomes less than 7 beacuse of hydrolysis of hypochlorite ion

2) Which one of the following mixtures will not result in making a buffer solution?

a. 10 mL of 1.0 M benzoic acid and 5.0 mL of 1.0 M hydrochloric acid

b. 10 mL of 1.0 M nitric acid and 5.0 mL of 1.0 M sodium hydroxide

c. 10 mL of 1.0 M nitric acid and 10 mL of 1.0 M methyl amine

d. 10 mL of 1.0 benzoic acid and 10 mL of 1.0 M sodium hydroxide

e. 10 mL of 1.0 M of sodium hydroxide and 10 mL of 1.0 M methyl amine

3. Which of the following acids is the weakest in aqueous solutions?

a. C6H5COOH (pKa = 4.19)

b. HBrO (pKa = 8.69)

c. HNO2 (pKa = 3.37)

d. CH2ClCOOH (pKa = 2.85)

e. HClO (pKa = 7.53)

1) Ans = remains at 7

Because ,

lithium hypochlorite is a salt of steong acid HOCl and String base LiOH.

Therefore,

solution is neutral.

2) Ans = a. 10 mL of 1.0 M benzoic acid and 5.0 mL of 1.0 M hydrochloric acid

Two acids cannot give buffer solution.

One acid and one base are required to form buffer solution.

3) Ans= b

weak acid = high pKa

strong acid = low pKa

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