QUESTION 9 Which range of pH is buffered by a oxalatic acid/sodium oxalate buffer? 6.5-7.5 3-5 3.3-5.3 4.2-4.4 QUESTION 10 Which of the following would act as a buffer system? Select all that apply 3NH4 Cr CH3COOH and HCI
molecule a molecule b H-C H,C. H C H C molecule c molecule d Which of the following could be used to form bilayers. Select all that apply molecule a molecule b molecule c molecule d
molecule a molecule b H-C H.C H.C N н.с н.с HC mo lecule c molecule d Which of the following have polar properties? Select all that apply. molecule a molecule b molecule c molecule d
molecule a molecule b H-C St H.C H,C HC H C H,C - molecule c molecule d Which of the following have non-polar properties? Select all that apply molecule a molecule b molecule c molecule d 0.2 point
Homework Answers
question 11)
pH = pKa + log ( A- / HA)
HA = NaH2PO4
A- = Na2HPO4
pH = pKa + log ( Na2HPO4 / NaH2PO4)
pKa of NaH2PO4 = 7.2
pH = 7
7 = 7.2 + log ( Na2HPO4 / NaH2PO4)
log ( Na2HPO4 / NaH2PO4) = 7 - 7.2
log ( Na2HPO4 / NaH2PO4) = - 0.2
Na2HPO4 / NaH2PO4 = 10^(-0.2)
Na2HPO4 / NaH2PO4 = 0.631
NaH2PO4 / Na2HPO4 = 1 / 0.631
NaH2PO4 / Na2HPO4 = 1.5
so the ratio is 1.5 NaH2PO4 / 1.0 Na2HPO4
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