Question

A class was performing an experiment to discover the pH values of some common household substances. The results of three groups are shown in the table below. Substance Group 1 pH Group 2 pH Group 3 pH Lemon juice 2. 2 2. 2 2. 1 Vinegar 2. 8 2. 8 8. 2 Baking soda 8. 4 8. 5 8. 4 Milk of magnesia 10. 2 10. 3 10. 2 Which statement best describes evidence that Group 3’s data are less valid than the data for the other two groups? Group 3’s pH value for lemon juice is lower than the values of the other two groups. Group 3’s pH value for vinegar is much higher than the values of the other two groups. Group 3’s pH value for baking soda does not exactly match the values of the other two groups. Group 3’s pH value for milk of magnesia is different from the value obtained by Group 2.

Answer 1

The statement best describes evidence that Group 3’s data are less valid than the data for the other two groups is Group 3’s pH value for vinegar is much higher than the values of the other two groups.

The correct option is B.

What is pH?

The meaning of pH is potential hydrogen. PH value tells us if the solution is acidic or basic.

pH value of 7 is considered as neutral which is of water.

The acidic solution comes below 7 and basic solutions come above 7.

Vinegar's pH value is 2.8, and it is acidic in nature, but group 3 result shows the value of pH 8.2 which is basic and wrong.

Thus, the correct option is b, Group 3’s pH value for vinegar is much higher than the values of the other two groups.

Learn more about pH, here:

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