Question

Bridget is in science class. Her teacher gives her two unknown substances and asks her to determine their relative pH. She places a piece of red litmus paper into both substances. The litmus paper turns purple when she places it into substance I. The litmus paper turns blue when she places it into substance II.

Which of the following is true about the relative pH of the two substances?
A.
Substance I is an acid and substance II is a base.
B.
Substance I is a neutral substance and substance II is an acid.
C.
Substance I is a neutral substance and substance II is a base.
D.
Substance I is a base and substance II is a neutral substance.

Answer 1

C

Step-by-step explanation:

Red litmus paper is used to identify base solutions. The paper turns blue when it is exposed to base solutions and remains red when exposed to acidic solutions. Therefore, substance I is neutral and substance II is a base.