Question

Consider the hypothesis below and answer the question that follows.

Adding salt to water increases the water’s boiling point.

If you performed an experiment to test this hypothesis, which action would introduce confounding variables into your experiment?

A.
You use distilled water sourced from the same place.
B.
You add black salt to some specimens and pink salt to others.
C.
You add equal quantities of salt in all the water specimens.
D.
You use earthen clay pots to store and boil all the water specimens.

Answer 1

Answer:

The correct answer is the option C.

Which is we add equal amount of salt in all the water samples.

Explanation:

• As in experiment we have to indicate that the boiling point of water increases with the addition of salt.
• Now we also know that water contains many salts as compared to the distilled water.
• So the boiling points of simple water and distilled water would be bit different.
• So we cannot choose one for our experiment. Instead we use all water samples of equal volume adding equal amount of salt in all samples.
• Then we will compare results for a net answer/result of experiment.