Question

1. test: before you begin testing with the 4.5 - 7.5 paper, list the ph values of the substances below that you found using the 0 - 14 ph indicator paper. then find the ph of each substance with the 4.5 - 7.5 paper.

material in the tube	ph value (0 to 14 paper)	ph value (4.5 to 7.5 paper)
milk	7	6.5
oven cleaner	13	7.5
saliva (human)	7	6.5
shampoo	7	7
stomach acid	1	4.5
water (distilled)	7	7

1. analyze: compare the ph values in each column.

a. how do these values compare?
the ph values from 4.5 - 7.5 are more precise for substances with ph values originally within the 4.5 - 7.5 range when measured with the 0 - 14 paper.
b. what is an advantage of using the 4.5 - 7.5 paper?

Explanation:

A. The 4.5 - 7.5 pH paper gives more precise readings for substances with pH values originally within the 4.5 - 7.5 range when measured with the 0 - 14 paper because it has a narrower range and can distinguish between values more accurately in that specific range.
B. An advantage of using the 4.5 - 7.5 paper is that it provides more accurate and detailed pH measurements for substances whose pH falls within the 4.5 - 7.5 range compared to the 0 - 14 paper which has a broader range and less precision for this specific interval.

Answer:

A. The 4.5 - 7.5 pH paper gives more precise readings for substances with pH values originally within the 4.5 - 7.5 range when measured with the 0 - 14 paper.
B. It provides more accurate and detailed pH measurements for substances whose pH falls within the 4.5 - 7.5 range.