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Question
Consider the following salt:
YCl
What would be the pH of the solution if, in YCl, Y is sodium? Give a reason for your answer.
Solution
pH is a measure of how acidic or basic a solution is. The range goes from 0 to 14, with 7 indicating neutral. pH of less than 7 indicates that the solution is acidic, whereas a pH of greater than 7 indicates a basic solution. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the solution. The solution that has more free hydrogen ions will be acidic, whereas the solution with free hydroxyl ions will be basic in nature.
Sodium chloride, commonly known as salt, is an ionic compound with the chemical formula NaCl, representing a ratio of sodium and chloride ions. It is a salt which is composed of a strong acid, i.e. hydrogen chloride (HCl), and a strong base, i.e. sodium hydroxide (NaOH). So, when it is dissolved in water it will have an equal ratio of hydrogen and hydroxyl ions. Thus, making the solution neutral, that is it will have a pH scaling 7.
\[\ce{NaOH + HCl -> NaCl + H2O}\]
Hence, the pH of the aqueous NaCl solution will be 7.
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