Question

Phosphoric acid is a triprotic acid with the following pKa values: pKa1 = 2.148, pKa2 = 7.198, pKa3 = 12.375. You wish to prepare 1.000 L of a 0.0200 M phosphate buffer at pH 7.640. 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. What mass of EACH salt will you add to the mixture?

Name: phosphoric acid is a triprotic acid with the following pka values pka12148 pka27198 pka312375 you wish to prepare 1000 l of a 00200 m phosphate buffer at ph 7640 to do this you choose to mix 35069
Uploaded: 2022-04-26T06:13:56-08:00
Duration: 3 min 51 s
Channel: Shaiju T
Description: phosphoric acid is a triprotic acid with the following pka values pka12148 pka27198 pka312375 you wish to prepare 1000 l of a 00200 m phosphate buffer at ph 7640 to do this you choose to mix 35069

          Phosphoric acid is a triprotic acid with the following pKa values:
pKa1 = 2.148, pKa2 = 7.198, pKa3 = 12.375.
You wish to prepare 1.000 L of a 0.0200 M phosphate buffer at pH 7.640. 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. What mass of EACH salt will you add to the mixture?

Added by Brandy C.

Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

Instant Answer

Solved by Expert Shaiju T

04/26/2022

Step 1

Given that the volume is 1.000 L and the concentration is 0.0200 M, the total moles of phosphate ions needed is: 0.0200 mol/L * 1.000 L = 0.020 mol Show more…

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Phosphoric acid is a triprotic acid with the following pKa values: pKa1 = 2.148, pKa2 = 7.198, pKa3 = 12.375. You wish to prepare 1.000 L of a 0.0200 M phosphate buffer at pH 7.640. 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. What mass of EACH salt will you add to the mixture?