CH 118 acids and bases - C H 118 Acid and Base Solutions I...

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CH 118 10/5/09 Acid and Base Solutions I. Water The pH of tap water is 7.82, which is almost neutral. The pH of distilled water is 5.71, which is slightly acidic. I would normally expect the pH of water to be 7 (neutral). However, there are many minerals and chemicals in tap water that could cause it to be slightly basic. In distilled water, many of the minerals have been removed, giving it a mildly acidic pH. In most cases, tap water may be healthier because it contains minerals that are important for your body and may be easier to digest because it is more neutral. The slight acidity of distilled water may not be as healthy. However, there are areas where tap water is not safe and distilled water is a better option. II. Comparison of HCl and HAc The pH of 0.2 M HCl is 0.24, which is highly acidic. The pH of 0.2 M HAc was 1.02, which is also acidic. HAc is considered a weak acid and HCl is considered a strong acid so these pHs were expected. Diluting both acids caused the pH to increase (become more basic) as indicated in the graphs below.
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