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13 Dec 2019

acid dissociaton constants for phosphoric acid are given below:

Ka1 Ka2 Ka3
H3PO4 7.5X10^-3 6.2X10^-8 4.8X10^-13

a buffer with a ph of 7.4 can best be made by using

A) H3PO4 and NaH2PO4

B) NaH2PO4 and Na2HPO4

C) Na2HPO4 and Na3PO4

D) All of the above

E) None of the above

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Bunny Greenfelder
Bunny GreenfelderLv2
17 Dec 2019

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Related questions

Phosphoric acid is a triprotic acid with the following pKa values:

=2.148; =7.198; =12.375

You wish to prepare 1.000 L of a 0.0500 M phosphate buffer at pH 7.540. To do this, you choose to mix the two salt forms involved in the second ionization, NaH2PO4 and Na2HPO4, in a 1.000 L volumetric flask and add water to the mark.

Question 1: What mass of each salt will you add to the mixture?

Mass NaH2PO4 () = ?

Mass Na2HPO4 () = ?

 

Question 2: What other combination of phosphoric acid and/or its salts could be mixed to prepare this buffer? (Check all that apply).

A. H3PO4 and NaH2PO4 ( and )

B. H3PO4 and Na2HPO4 ( and ) 

C. H3PO4 and Na3HPO4 ( and ) 

D. NaH2PO4 and NA3PO4 ( and ) 

E. Na2HPO4 and NA3PO4 ( and )

Calculate the pOH of a solution that results from mixing 24 mL of 0.12 M HBrO(aq) with 26 mL of 0.14 M NaBrO(aq). The Ka value for HBrO is 2 x 10-9. A buffer consists of 0.17 M NaH2PO4 and 0.3 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 0.17 M NaH2PO4 and 0.3 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.

You are instructed to create 200. mL of a 0.25 M phosphate buffer with a pH of 6.8. 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 for the acid component of your buffer? H3PO4 NaH2PO4 Na2HPO4 Na3PO4

Which of the available chemicals will you use for the base component of your buffer? H3PO4 NaH2PO4 Na2HPO4 Na3PO4

What is the molarity needed for the acid component of the buffer? ___M

What is the molarity needed for the base component of the buffer? ___M

How many moles of acid are needed for the buffer? ___mol

How many moles of base are needed for the buffer? ___mol

How many grams of acid are needed for the buffer? ___g

How many grams of base are needed for the buffer? ___g

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