The conjugate base of HCO^3 - is a. HXO^3- b. CO_3^-2 c. H_2 CO_3 d. CO_2 The hy

Question

The conjugate base of HCO^3 - is a. HXO^3- b. CO_3^-2 c. H_2 CO_3 d. CO_2 The hydronium concentration ([H_2O^+]) in a sample of wine is 32 times 10^-4 M. What is the PH of the wine sample? a. 3.2 b. 3.5 c. 4.0 d. 7.0 A 0.10 M solution of the deadly poison hydrogen cyanide, HCN, has a pH of 5.2. Calculate the [H_3 O^+] of the solution a. 0.794 M H_3O^+ b. 5.2 M H_O^+ c. 6.31 times 10^-6 M H_2O^+ d. 1.0 times 10^-11 M H_3O^+ A 0.10 M solution of ammonium ion, NH_4^+, has a pH of 5.6. Ammonium ion is a a. strong acid. b. weak acid. c. strong base. D. weak base. The OH^- concentration in a milk sample 6.2 times 10^-4 M. The value of [H_2O] in the milk sample is a. 6.2 times 10-8 M and the milk is basic. b. 1.0 times 10-7 M and the milk is neutral. c. 6.2 times 10-7 and the milk is acidic. d. 1.6 times 0.7 M M and the milk is acidic. A cleaning solution is found to have [OH^-] = 5.0 times 10^-5 M. What is the pH? a. 2.30 b. 5.00 c. 11.70 d. 12.00 When a 10.00 mL sample of household vinegar (dilute aqueous acetic acid) is titrated, 25.0 mL of 0.200 M NaOH solution is required to reach the end point. What is the acid concentration of the vinegar in moles per liter. The neutralization reaction is CH_3CO_2 H (aq) + NaOH (aq) rightarrow CH_3CO_2 Na^+ (aq) + H_2O (l) a. 0.890 M b. 0.500 M c. 0.200 M d. 2.00 M

Explanation / Answer

Q27.

a conjugated base forms when HCO3- donates H+ so CO3-2 will form the "base". Note that CO3-2 will be able to accept H+ in order to form the acid again

so

from the list

choose B

Q28.

3.2*10^-4 M of H3O+

pH = -log( H3O+)

pH = -log(3.2*10^-4) = 3.49

choose B, 3.5

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