H of Strong Acid Solutions

We will now learn to calculate the pH for a solution containing a strong acid of known concentration. For example, if we know a solution contains 1.0 M HCl, how can we find fhe pH of the solution To answer this question we must know that when HCl dissolves in water, each molecule dissociates (ionizes) into H and CP ions. That is, we must know that HCl is a strong acid. Thus, although the label on the bottle says 1.0 M HCl, the solution contains virtually no HCl molecules. A 1.0 M HCl solution contains H and CP ions rather than HCl molecules. Typically, container labels indicate the substance(s) used to make up the solution but do not necessarily describe the solution components after dissolution. In this case, 

A chemical that changes color depending on the pH of a solution 

A strip of paper coated with a combination of acid-base indicators 

Indicator paper being used to measure the pH of a solution. The pH is determined by comparing the color that the solution turns the paper to the color chart. 

The pH ranges shown are approximate. Specific transition ranges depend on the indicator soivent chosen. 

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