Acid and base
exercises
| Acid and base exercises |
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Ascorbic acid is commonly known as vitamin C. The lollies inside the packet pictured on the left will have a pH lower or higher than 7? | |
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A number of packaged foods, such as the chocolate pictured on the left, have addittives added. Food acids are commonly added to the food. If the chocolate pictured on the left was dissolved in water and tested with universal indicator what colour will the universal indicator turn? | |
| Yoghurt tastes sour. Can you explain why? | |
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Orange juice contains citric acid. Citric acid is sometimes labelled on the package as food additive 300. Sugar is sometimes added to give a sweet taste to an otherwise sour tasting fruit juice. Explain why lemon and orange juices taste sour. | |
| Bacteria attack teeth by producing acid. It is the acid that destroys the tooth enamel and produces cavities in the tooth. Do you think the pH of the toothpaste will be higher or lower than 7? Explain. | |
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The stomach produces strong hydrochloric acid to help digest food. Sometimes the acid builds up and causes stomach pain. | |
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Mylanta is an antacid and is used to calm an upset stomach. An upset stomach results from an over production of stomach acid. Do you think Mylanta contains a strong acid, weak base or a strong base? Explain. | |