A buffer consists of 0.24 M NaH2PO4 and 0.47 M Na2HPO4. Given that the K values...
A buffer consists of 0.24 M NaH2PO4 and 0.47 M Na2HPO4. Given that the K values for H3PO4 are, Ka1 = 7.2 x 10-3, Ka2 = 6.3 x 10-8, and Ka3 = 4.2 x 10-13, calculate the pH for this buffer.
I know that the answer is 7.49 because pH = -log(6.3 x 10-8) + log(0.47/0.24). What I want to know is WHY 6.3 x 10-8 was used instead of Ka1 or Ka3. Thanks.
Homework Answers
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A buffer consists of 0.24 M NaH2PO4 and
0.47 M Na2HPO4. Given that the K values...
A buffer consists of 0.24 M NaH2PO4 and 0.47 M Na2HPO4. Given that the K values...
A buffer consists of 0.24 M NaH2PO4 and 0.47 M Na2HPO4. Given that the K values for H3PO4 are, Ka1 = 7.2 x 10-3, Ka2 = 6.3 x 10-8, and Ka3 = 4.2 x 10-13, calculate the pH for this buffer.
A buffer consists of 0.34 M NaH2PO4 and 0.28 M Na2HPO4. Given that the values for...
A buffer consists of 0.34 M NaH2PO4 and 0.28 M Na2HPO4. Given that the values for H3PO4 are, Ka1 -7.2 x 10-3 Ka2 = 6.3 x 10-8 and Ka3 = 4.2x 10-13, calculate the pH for this buffer. Selected Answer: Correct Answer: [None Given] 7.12 10.02
Phosphoric acid, H3PO4, is a triprotic acid with the following acid dissociation constants: Ka1 = 7.5 × 10-3 Ka2 = 6.2...
Phosphoric acid, H3PO4, is a triprotic acid with the following acid dissociation constants: Ka1 = 7.5 × 10-3 Ka2 = 6.2 × 10-8 Ka3 = 4.2 × 10-13 Which of the following combinations would be best for preparing a pH 7 buffer? a. H3PO4 and NaH2PO4 b. H3PO4 and HCl c. Na2HPO4 and Na3PO4 d. NaH2PO4 and Na2HPO4 e. H3PO4 and Na3PO4
Be sure to answer all parts. A buffer consists of 0.12 M NaHPO4 and 0.26 M Na2HPO4. Phosphoric acid is a triprotic...
Be sure to answer all parts. A buffer consists of 0.12 M NaHPO4 and 0.26 M Na2HPO4. Phosphoric acid is a triprotic acid (Ka1 7.2 X 103, K2-6.3 x 108, K3 - 4.2 x 1013) (a) Which K, value is most important to this buffer? Ka1 is most important. K z is most important. Kn3 is most important. (b) What is the buffer pH?
You are instructed to create 400. mL of a 0.40 M phosphate buffer with a pH...
You are instructed to create 400. mL of a 0.40 M
phosphate buffer with a pH of 6.4. You have phosphoric acid and the
sodium salts NaH2PO4,
Na2HPO4, and Na3PO4
available. (Enter all numerical answers to three significant
figures.)
H3PO4(s) +
H2O(l)
H3O+(aq) +
H2PO4−(aq)
Ka1 = 6.9 ✕ 10−3
H2PO4−(aq) +
H2O(l)
H3O+(aq) +
HPO42−(aq)
Ka2 = 6.2 ✕ 10−8
HPO42−(aq) +
H2O(l)
H3O+(aq) +
PO43−(aq)
Ka3 = 4.8 ✕ 10−13
Which of the available chemicals will you use...
You are instructed to create 400. mL of a 0.39 M phosphate buffer with a pH...
You are instructed to create 400. mL of a 0.39 M phosphate buffer with a pH of 6.2. You have phosphoric acid and the sodium salts NaH2PO4, Na2HPO4, and Na3PO4 available. (Enter all numerical answers to three significant figures.) H3PO4(s) + H2O(l) = H30+ (aq) + H2P04 (aq) Kai = 6.9 x 10-3 H2PO4 (aq) + H20(1) =H30+ (aq) + HPO42-(aq) Ka2 = 6.2 x 10-8 HPO42-(aq) + H20(I) = H30+(aq) + PO43-(aq) Ka3 = 4.8 x 10-13 Which of...
You are instructed to create 400. mL of a 0.39 M phosphate buffer with a pH...
You are instructed to create 400. mL of a 0.39 M phosphate buffer with a pH of 6.2. You have phosphoric acid and the sodium salts NaH2PO4, Na2HPO4, and Na3PO4 available. (Enter all numerical answers to three significant figures.) H3PO4(s) + H20(1) =H30+ (aq) + H2PO4 (aq) Kai = 6.9x10-3 H2PO4 (aq) + H20() = H30+(aq) + HPO42- (aq) Ka2 = 6.2x 10-8 HPO42-(aq) + H20(I) = H30+(aq) + PO43-(aq) Ka3 = 4.8 x 10-13 Which of the available chemicals...
A buffer consists of 0.27 M KHCO3 and 0.33 M K2CO3. Given that the K values...
A buffer consists of 0.27 M KHCO3 and 0.33 M K2CO3. Given that the K values for H2CO3 are, Ka1 = 4.5 x 10-7 and Ka2 = 4.7 x 10-11, calculate the pH for this buffer.
A buffer consists of 0.53 M KHCO3 and 0.59 M K2CO3. Given that the K values...
A buffer consists of 0.53 M KHCO3 and 0.59 M K2CO3. Given that the K values for H2CO3 are, Ka1 = 4.5 x 10-7 and Ka2 = 4.7 x 10-11, calculate the pH for this buffer.
Calculate the concentrations of all species found in 0.30 M Na2HPO4 solution as well as the pH of...
Calculate the concentrations of all species found in 0.30 M Na2HPO4 solution as well as the pH of this solution: [ For H3PO4 Ka1=7.11x10^-3, Ka2=6.34x10^-8, and Ka3=4.33x10^-13]. a. [Na+] b. [H3PO4] c. [H2PO4] d. [HPO4] e. [PO4] f. [H+] g.[OH-] h. pH=?
A buffer consists of 0.34 M NaH2PO4 and 0.28 M Na2HPO4. Given that the values for H3PO4 are, Ka1 -7.2 x 10-3 Ka2 = 6.3 x 10-8 and Ka3 = 4.2x 10-13, calculate the pH for this buffer. Selected Answer: Correct Answer: [None Given] 7.12 10.02
Be sure to answer all parts. A buffer consists of 0.12 M NaHPO4 and 0.26 M Na2HPO4. Phosphoric acid is a triprotic acid (Ka1 7.2 X 103, K2-6.3 x 108, K3 - 4.2 x 1013) (a) Which K, value is most important to this buffer? Ka1 is most important. K z is most important. Kn3 is most important. (b) What is the buffer pH?
You are instructed to create 400. mL of a 0.40 M
phosphate buffer with a pH of 6.4. You have phosphoric acid and the
sodium salts NaH2PO4,
Na2HPO4, and Na3PO4
available. (Enter all numerical answers to three significant
figures.)
H3PO4(s) +
H2O(l)
H3O+(aq) +
H2PO4−(aq)
Ka1 = 6.9 ✕ 10−3
H2PO4−(aq) +
H2O(l)
H3O+(aq) +
HPO42−(aq)
Ka2 = 6.2 ✕ 10−8
HPO42−(aq) +
H2O(l)
H3O+(aq) +
PO43−(aq)
Ka3 = 4.8 ✕ 10−13
Which of the available chemicals will you use...
You are instructed to create 400. mL of a 0.39 M phosphate buffer with a pH of 6.2. You have phosphoric acid and the sodium salts NaH2PO4, Na2HPO4, and Na3PO4 available. (Enter all numerical answers to three significant figures.) H3PO4(s) + H2O(l) = H30+ (aq) + H2P04 (aq) Kai = 6.9 x 10-3 H2PO4 (aq) + H20(1) =H30+ (aq) + HPO42-(aq) Ka2 = 6.2 x 10-8 HPO42-(aq) + H20(I) = H30+(aq) + PO43-(aq) Ka3 = 4.8 x 10-13 Which of...
You are instructed to create 400. mL of a 0.39 M phosphate buffer with a pH of 6.2. You have phosphoric acid and the sodium salts NaH2PO4, Na2HPO4, and Na3PO4 available. (Enter all numerical answers to three significant figures.) H3PO4(s) + H20(1) =H30+ (aq) + H2PO4 (aq) Kai = 6.9x10-3 H2PO4 (aq) + H20() = H30+(aq) + HPO42- (aq) Ka2 = 6.2x 10-8 HPO42-(aq) + H20(I) = H30+(aq) + PO43-(aq) Ka3 = 4.8 x 10-13 Which of the available chemicals...
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