The following 0.1 M aqueous solutions are arranged in order of increasing pH,with the highest pH on the far right. Which one of the following 0.10 M aqueous solutions should be placed in the empty box?

Question

The following 0.1 M aqueous solutions are arranged in order of increasing pH,with the highest pH on the far right.  Which one of the following 0.10 M aqueous solutions should be placed in the empty box?

Quizplus · Accepted Answer

HCOOH is a weak acid, which means it will produce fewer H+ ions in solution, resulting in a higher pH compared to the other options. NaI, NaClO, and CH3NH3Cl (methylammonium chloride) are all salts of strong acids and bases, so they will produce neutral solutions. CS2Na2 (sodium sulfide) is a salt of a strong base and a weak acid, so it will produce a basic solution, but it is not as basic as HCOOH. Thus, HCOOH should be placed in the empty box to complete the order of increasing pH.

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