Question

The pH scale measures the acidity or the basicity of a solution. Solutions that have a pH below 7 are acids. Solutions that have a low pH are more acidic than solutions that have a higher pH. The graph below shows the pH of four common fruit juices.

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A student studying acidity of juices did a taste test and determined that the orange juice was the sweetest juice and the lemon and lime juices were the sourest. Based on this information, which is the best inference the student could make about acidity?
Juices with more sugar content have a lower pH.
Higher acidity causes juices to taste more sour.
Juice that tastes sour has a higher pH than juice that tastes sweet.
Lime juice tastes more sour than orange juice.

Answer 1

Answer: Higher acidity causes juices to taste more sour.

Reason: pH measures acidity (lower pH = more acidic). The student found lemon and lime (lowest pH) were the sourest, so greater acidity corresponds with a sourer taste. The other choices are unsupported or backwards.