The Ka for formic acid (HCO2H) is 1.8 × 10-4. What is the pH of a 0.35 M aqueous solution of sodium formate (NaHCO2)?

1 answer
Question:

The Ka for formic acid (HCO2H) is 1.8 × 10-4. What is the pH of a 0.35 M aqueous solution of sodium formate (NaHCO2)?

Answers

Answer:9.36Explanation:Sodium formate is the conjugate base of formic acid. Also,[tex]K_a\times K_b=K_w[/tex][tex]K_b[/tex] for sodium formate is [tex]K_b=\frac {K_w}{K_a}[/tex]Given that:[tex]K_a[/tex] of formic acid = [tex]1.8\times 10^{-4}[/tex]And, [tex]K_w=10^{-14}[/tex]So, [tex]K_b=\frac {10^{-14}}{1.8\times 10^{-4}}[/tex][tex]K_b=5.5556\times 10^{-11}[/tex]Concentration = 0.35 MHCOONa    ⇒     Na⁺ +    HCOO⁻Consider the ICE take for the formate  ion as:                                    HCOO⁻ + H₂O   ⇄   HCOOH + OH⁻At t=0                              0.35                            -              -At t =equilibrium           (0.35-x)                          x           x            The expression for dissociation constant of sodium formate is:[tex]K_{b}=\frac {[OH^-][HCOOH]}{[HCOO^-]}[/tex][tex]5.5556\times 10^{-11}=\frac {x^2}{0.35-x}[/tex]Solving for x, we get:x = 0.44×10⁻⁵  MpOH = -log[OH⁻] = -log(0.44×10⁻⁵) = 4.64pH + pOH = 14So, pH = 14 - 4.64 = 9.36

Similar Solved Questions

2 answers

How much energy, in joules, is released by an earthquake of magnitude 8? ______________ joules (Use scientific notation. Use the multiplication symbol in the math palette as needed.)

How much energy, in joules, is released by an earthquake of magnitude 8? ______________ joules (Use scientific notation. Use the multiplication symbol in the math palette as needed.)...
1 answer

Ok can you plzz look at this and help and what does aoc mean

ok can you plzz look at this and help and what does aoc mean...
1 answer

Give three reasons why we study history. yeah i only need 3 reasons

give three reasons why we study history. yeah i only need 3 reasons...
1 answer

The Space Needle opened in 1962 at

The Space Needle opened in 1962 at...
1 answer

Ayo only answer if u speak spanish

ayo only answer if u speak spanish...
1 answer

T object]user: which of the following is not a type of plate boundary? a. transform b. divergent c. convergent d. tectonic

T object]user: which of the following is not a type of plate boundary? a. transform b. divergent c. convergent d. tectonic...
2 answers

Help!!! ASAP I need answer now !! And fast

Help!!! ASAP I need answer now !! And fast...
2 answers

A new bank attracts customers by not charging any fees and paying an average of 2 percent on deposits. To ensure that it will have customers for years to come, the bank is charging 1 percent on loans. What is the bank’s financial outlook?

A new bank attracts customers by not charging any fees and paying an average of 2 percent on deposits. To ensure that it will have customers for years to come, the bank is charging 1 percent on loans. What is the bank’s financial outlook?...
1 answer

Find the Positive, Negative and Complex Roots of the following Function f(x)=x^6-x^5-12x-x^4+4x^3-12x^2+12

Find the Positive, Negative and Complex Roots of the following Function f(x)=x^6-x^5-12x-x^4+4x^3-12x^2+12...
1 answer

The money supply increases when the fed a. sells bonds. the increase will be larger, the larger is the reserve ratio. b. buys bonds. the increase will be larger, the larger is the reserve ratio. c. sells bonds. the increase will be larger, the smaller is the reserve ratio. d. buys bonds. the increase will be larger, the smaller is the reserve ratio.

The money supply increases when the fed a. sells bonds. the increase will be larger, the larger is the reserve ratio. b. buys bonds. the increase will be larger, the larger is the reserve ratio. c. sells bonds. the increase will be larger, the smaller is the reserve ratio. d. buys bonds. the increas...
2 answers

Which location was associated with political machines in the 19th century? A. Tammany Hall in New York City B. Haymarket Square in Chicago C. Independence Hall in Philadelphia D. Ellis Island in New York City

Which location was associated with political machines in the 19th century? A. Tammany Hall in New York City B. Haymarket Square in Chicago C. Independence Hall in Philadelphia D. Ellis Island in New York City...
1 answer

Why is photosynthesis considered a chemical change

Why is photosynthesis considered a chemical change...
1 answer

___ Mechanism responsible for the low abundance of helium of Saturn's atmosphere. Helium condenses in the upper layers to form a mist, which rains down toward Saturn's interior, just as water vapor forms into rain in the atmosphere of Earth.

___ Mechanism responsible for the low abundance of helium of Saturn's atmosphere. Helium condenses in the upper layers to form a mist, which rains down toward Saturn's interior, just as water vapor forms into rain in the atmosphere of Earth....
2 answers

How old is gabriella if she was 11 years old 19 years ago

how old is gabriella if she was 11 years old 19 years ago...
2 answers

Is it possible to have an expression that uses brackets without using parentheses? Explain.

Is it possible to have an expression that uses brackets without using parentheses? Explain....
1 answer

2.   When an author focuses on characterization in a piece of fiction, it means that he or she provides details about the         A. biggest conflicts in the story.   B. main themes of the story.   C. various settings of the story.   D. different people in the story.

2.   When an author focuses on characterization in a piece of fiction, it means that he or she provides details about the         A. biggest conflicts in the story.   B. main themes of the story.   C. various settings of the story.   D. different people in the story....
1 answer

(Our headmistress has taught us this poem) This tense is right or wrong

(Our headmistress has taught us this poem) This tense is right or wrong...
2 answers

If ST has endpoints S(-6, -1) and T(0, 1), then the midpoint M of ST lies on the x-axis. SOMEONE PLEASE HELP!!!

If ST has endpoints S(-6, -1) and T(0, 1), then the midpoint M of ST lies on the x-axis. SOMEONE PLEASE HELP!!!...
1 answer

The sequence of main events that move the plot forward is known as? 1. Exposition 2. Rising Action 3. Climax 4. Resolution

The sequence of main events that move the plot forward is known as? 1. Exposition 2. Rising Action 3. Climax 4. Resolution...
2 answers

The Great Ice Age occurred during the _________. A. Eocene B. Miocene C. Oligocene D. Pleistocene

The Great Ice Age occurred during the _________. A. Eocene B. Miocene C. Oligocene D. Pleistocene...

-- 0.018367--