1. An acid is a substance that has a pH value that is lower than 7. A base is a substance that has a pH that is greater than 7. Citric acid commonly present in sour foods. Which one of these might be the pH of a citric acid solution?
pH=3.2
pH=7.0
pH=10.3
pH=14.0
2. Which mixture is homogenous?
Salt stirred together with sugar
Sugar dissolved in water
water droplets scattered in the air to form fog
dirt suspended in water
3. Which mixture is heterogeneous
salt dissolved in water
air
metal ally
tossed salad
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