“The dihydrogen phosphate ion has the ability to act as an acid in the presence

Question

“The dihydrogen phosphate ion has the ability to act as an acid in the presence of a base and in the presence of an acid. “ ghap i5 2. This question has three parts a. The dihydrogen phosphat AND as a base in the presence of an acid. e ion has the ability to act as an acid in the presence of a base i. What is this property called? i. Write two reactions involving the dihydrogen phosphate ion (1) reacting with a (strong) base, and (2) reacting with a (strong) acid. Make sure to label the corresponding acid, base, conjugate acid, and conjugate base. Complete the following reaction. Decide, on the basis of relative acid strengths whether the reaction is more likely to go in the direction written or in the opposite direction. Explain your answer. b. c. As I write this exam, I am drinking a cup of delicious coffee! On a whim, I measured the pH of the coffee, and I found that the pH of my coffee was 5.12. What are the concentrations of hydronium ion and hydroxide ions in this solution?

Explanation / Answer

(a)

(i)

A species that can act as both an acid and a base is called amphoteric species.

(ii)

H2PO4- (aq.) + NaOH (aq.) -----> HPO42- (aq.) + H2O (l) + Na+ (aq.)

H2PO4- (aq.) + HCl (aq.) ----------> H3PO4 (aq.) + Cl- (aq.)

(b)

H2S (aq.) + CN- (aq.) = HCN (aq.) + HS- (aq.)

Goes forward more.

(c)

pH = 5.12

- Log[H3O+] = 5.12

[H3O+] = 7.58 * 10-6 M

And

[H3O+][OH-] = 1.0 * 10-14

[OH-] = 1.0 * 10-14 / ( 7.58 * 10-6)

[OH-] = 1.32 * 10-9 M

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