🤓 Based on our data, we think this question is relevant for Professor Bliem's class at UNC.
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?
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