Chem 9

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Which species is a diprotic acid

H2CO3

Which species is the conjugate acid of HCO3-?

H2CO3

Which salt forms a solution with a pH < 7 when dissolved in water?

(NH4)2SO4

What is the net ionic equation for the acid-base reaction of hydrobromic acid with sodium hydroxide?

-OH(aq) + H+(aq) → H2O(l)

Which buffer solution has the lowest pH (HF has Ka = 7.2 × 10-4)?

0.20 M HF and 0.10 M NaF

What is the molarity of an HCl solution if 43.6 mL of a 0.125 M KOH solution are needed to titrate a 25.0 mL sample of the acid according to the equation below? KOH(aq) + HCl(aq) → H2O(l) + KCl(aq)

0.218 M HCl

What is the molarity of an HNO3 solution if 24.1 mL of a 0.250 M Ba(OH)2 solution are needed to titrate a 15.0 mL sample of the acid according to the equation below? Ba(OH)2(aq) + 2 HNO3(aq) 2 H2O(l) + Ba(NO3)2(aq)

0.803 M HNO3

Which solution has the highest pH?

1.0 × 10-7 M -OH

The pH of a lime is 1.90. What is the [H3O+]?

1.3 × 10-2 M H3O+

Which solution has the lowest pH?

1.3 × 10-8 M -OH

The [-OH] in a sample of egg whites is 6.3 × 10-7 M. What is the [H3O+] in these egg whites?

1.6 × 10-8 M H3O+

The [H3O+] in a cabernet sauvignon wine is 5.9 × 10-4 M. What is the [-OH] in this wine?

1.7 × 10-11 M -OH

Which solution has the highest pH?

1.9 × 10-8 M H3O+

What is the pH of a peach with a [-OH] = 3.2 × 10-11 M?

3.51

How many milliliters of 0.653 M NaOH are needed to neutralize 25.0 mL of a 1.02 M HBr solution? The neutralization reaction is: NaOH(aq) + HBr(aq) → H2O(l) + NaBr(aq)

39.1 mL NaOH

What is the pH of a buffer that contains 0.15 M CH3COOH and 0.10 M NaCH3COO (Ka = 1.8 × 10-5)?

4.57

What is the pH of a cleaning solution with a [H3O+] = 7.4 × 10-9 M H3O+?

8.13

Which term correctly describes the medical condition in which the pH of blood is greater than 7.45, and therefore the blood is more basic than normal?

Alkalosis

Which compound is a weak acid?

CH3COOH

Which solution containing an equal number of moles of each of the substances is a buffer?

CH3COOH and NaCH3COO

Which species is the conjugate base of HCN?

CN-

What are the products of the acid-base reaction of sodium carbonate with acetic acid?

CO2(g) + H2O(l) + 2 NaCH3COO(aq)

Correctly identify the missing product in the following acid-base reaction: NH3 + HCl NH4+ + ________

Cl-

Which ion is the strongest base?

F-

Which species is the conjugate acid of HPO42-?

H2PO4-

Which species is the conjugate acid of HS-?

H2S

Which species is the conjugate base of HPO42-?

H2po4-

Which of the following is the hydronium ion?

H3O+

Correctly identify the conjugate acid-base pairs in the following equation: HC2H3O2(l) + H2O(l) H3O+(aq) + C2H3O2-(aq)

HC2H3O2/ C2H3O2-and H2O/ H3O+

Which species can act as a Brønsted-Lowry acid?

HCl

In the acid-base reaction: F-(aq) + HNO3(aq) HF(aq) + NO3-(aq) ________.

HNO3 is the acid and its conjugate base is NO3-(aq), and F- is the base and its conjugate acid is HF

Which acid has the strongest conjugate base?

Hydrocyanic acid HCN (Ka = 4.9 × 10-10)

Which acid is the weakest?

Hydrocyanic acid HCN (Ka = 4.9 × 10-10)

Which acid is the strongest?

Hydrogen sulfate ion HSO4- (Ka = 1.2 × 10-2)

Which species can act as an Arrhenius base?

LiOH

What is the balanced equation for the acid-base reaction of nitrous acid with lithium hydroxide?

LiOH(aq) + HNO2(aq) H2O(l) + LiNO2(aq)

Which species is the conjugate base of NH3?

NH2-

Which species can act as a Brønsted-Lowry base?

NO3-

Which salt forms a basic solution when dissolved in water?

Na3PO4

What is the correct name of HNO2?

Nitrous acid

What is the correct name of H2SO4?

Sulfuric acid

An Arrhenius acid is

a compound that contains a hydrogen atom and dissolves in water to form a hydrogen ion, H+

An Arrhenius base is

a compound that contains hydroxide and dissolves in water to form OH-

Which pH value indicates the higher concentration of OH-?

pH = 11.4

Which pH value indicates the higher concentration of H3O+?

pH = 5.2

A Brønsted-Lowry base is

proton acceptor

A Brønsted-Lowry acid is

proton donor

In the acid-base reaction: HCN(aq) + F-(aq) CN-(aq) + HF(aq), where Ka (HCN) = 4.9 × 10-10 and Ka (HF) = 7.2 × 10-4, the ________.

reactants are favored

Ammonia, NH3, is an example of a ________.

weak base


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