Jemele adds grape juice to four samples of household substances. Grape juice turns red in a solution with a low pH and green in a solution with a high pH. Some of her data is recorded in the table below.

Question

Substance Color of Grape Juice
ammonia green
baking soda ?
lemon juice red
vinegar ?


What color will the grape juice turn in baking soda or vinegar, and why?

A.
The grape juice will turn green in the baking soda and red in the vinegar, because baking soda is a base and vinegar is an acid.

B.
The grape juice will turn green in the baking soda and red in the vinegar, because baking soda is an acid and vinegar is a base.

C.
The grape juice will turn red in the baking soda and green in the vinegar, because baking soda is a base and vinegar is an acid.

D.
The grape juice will turn red in the baking soda and green in the vinegar, because baking soda is an acid and vinegar is a base.

Answer 1

The correct answer is:

A. The grape juice will turn green in the baking soda and red in the vinegar, because baking soda is a base and vinegar is an acid.

Here's the reasoning:

• Baking soda (sodium bicarbonate) is a basic substance, so it will result in a higher pH, causing the grape juice to turn green.
• Vinegar (acetic acid) is acidic and has a low pH, causing the grape juice to turn red.