1- Which of the following combinations of chemicals could be used to make a buff

ID: 966446 • Letter: 1

Question

1- Which of the following combinations of chemicals could be used to make a buffer solution? HCl/NH3 or HCl/H3PO4 or NaOH/NH3 or HCl/NaOH

2-When equal molar amounts of the following sets of compounds are mixed in water, which will not form a buffer solution?

CH3CO2H with NaCH3CO2

NaH2PO4 with Na2HPO4

HNO3 with NaNO3

NH3 with NH4Cl

3-Which is the best acid to use in the preparation of a buffer with pH = 3.3?

HIO3 ((Ka = 1.7 × 10–1)

HOI (Ka = 2.0 × 10–11)

HNO2 (Ka = 4.5 × 10–4)

HNO3

Which of the following is TRUE?

The equivalence point is where the amount of acid equals the amount of base during any acid-base titration.

A titration curve is a plot of pH vs. the [base]/[acid] ratio.

An indicator is not pH sensitive.

At the equivalence point, the pH is always 7.

None of the above are true.

CH3CO2H with NaCH3CO2

NaH2PO4 with Na2HPO4

HNO3 with NaNO3

NH3 with NH4Cl

1) HCl/NH3 can act as basic buffer

weak acid (base) and its conjugate are act as buffer solution.

2) HNO3 with NaNO3 cannot act as buffer

3) HNO2 is suitable for preparing buffer with PH =3.3

4) The equivalence point is where the amount of acid equals the amount of base during any acid-base titration.

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