Chemistry Practice Problems Ionic Salts Practice Problems Solution: An unknown salt is either NaF, NaCl, or NaOCl. Whe...

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Solution: An unknown salt is either NaF, NaCl, or NaOCl. When 0.050 mol of the salt is dissolved in water to form 0.500 L of solution, the pH of the solution is 8.08.What is the identity of the salt?

Problem

An unknown salt is either NaF, NaCl, or NaOCl. When 0.050 mol of the salt is dissolved in water to form 0.500 L of solution, the pH of the solution is 8.08.

What is the identity of the salt?

Solution

We are asked for the identity of the salt that will give a solution of pH 8.08.


Ionic salts are made up of positively charged ion (cation) and a negatively charged ion (anion). To determine if the ionic salt would be acidic, basic, or neutral, we need to identify the acidity or basicity of the cation and anion.


For cations:

transition metal

▪ charge of +2 or higheracidic
▪ less than +2 → neutral solution

main group metal

▪ charge of +3 or higher acidic
▪ less than +3 → neutral solution

amines - compounds with only nitrogen or hydrogen (i,e. NH3) or with carbon, nitrogen and hydrogen

positive amines acidic


For anions:

• To determine if an anion is basic or neutral you must add an H+ to it.

▪ If adding an H+creates a weak acid → negative ion is basic

▪ if adding an H+creates a strong acid → negative ion is neutral

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