Posted by help on Wednesday, December 1, 2010 at 10:33pm.
You are supposed to recognize that HCl is a strong acid (meaning it ionizes 100%) so pure water is pH of 7. Then you add 0.01 mol HCl which adds to 500 mL water. That 0.01 mol becomes 0.01/0.5 L = ?? and convert that to pH.
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