Question

Which of the following combinations is not suitable for making a buffer? A. Na2CO3 and NaHCO3...

Which of the following combinations is not suitable for making a buffer?

A. Na2CO3 and NaHCO3

B. HClO4 and NaClO4

C. NaH2PO4 and Na2HPO4

D. H3PO4 and NaH2PO4

E. NH4Cl and NH3

Science   Chemistry   
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Homework Answers

Answer #1

Answer: B. HClO4 and NaClO4

Explanation:

HClO4 is a strong acid and ClO4- is its conjugate base

A buffer solution (more precisely, pH buffer or hydrogen ion buffer) is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa. Its pH changes very little when a small or moderate amount of strong acid or base is added to it and thus it is used to prevent changes in the pH of a solution. Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical applications. Many life forms thrive only in a relatively small pH range so they utilize a buffer solution to maintain a constant pH. One example of a buffer solution found in nature is blood.

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