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.
• transition metal
▪ charge of +2 or higher → acidic
▪ 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
• 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
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?
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