Question

an unknown substance has a ph of 4. which statement is true? *
a. it is alkaline
b. it is a base
c. it is neutral
d. it is an acid
which of the following properties best describes a base? *
a. sour taste
b. donates hydrogen ions
c. slippery texture
d. ph less than 7
a piece of blue litmus paper is dipped into a liquid and turns red. what does this indicate? *
a. the liquid is an acid
b. the liquid is a base
c. the liquid is neutral
d. the test is inaccurate

Explanation:

1. For the first question, substances with pH less than 7 are acids. Since the unknown substance has a pH of 4 (less than 7), it is an acid.
2. For the second question, bases have a slippery texture. Acids have a sour taste and donate hydrogen - ions, and bases have a pH greater than 7.
3. For the third question, blue litmus paper turns red in acidic solutions.

Answer:

1. D. It is an acid
2. C. Slippery texture
3. A. The liquid is an acid