Column A Column B 1. a. pH paper b. Litmus paper 3. only tells you acid or base can tell you the pH number turns red or blue only can turn a variety of colors that represent different pH numbers

It seems there is a bit of a mismatch between the numbers and letters in your list, but I will correct it in my response. We'll label what seems to be Column A with numbers (1 and 2) and Column B with letters (a and b) as follows:

1. Litmus paper 2. pH paper

a. Only tells you acid or base b. Can tell you the pH number; turns red or blue only; can turn a variety of colors that represent different pH numbers

Now, let's match these up correctly:

1a. Litmus paper - Only tells you acid or base: Litmus paper is a type of test paper that can indicate whether a solution is acidic or basic. The paper turns red in acidic solutions and blue in basic solutions. It does not give you the exact pH value, only a general idea of whether a substance is an acid or a base.

2b. pH paper - Can tell you the pH number; can turn a variety of colors that represent different pH numbers: pH paper is a more precise tool that is used to determine the pH level of a solution. Unlike litmus paper, which only turns red or blue, pH paper can change into a variety of colors, each color representing a different pH level on a scale typically ranging from 1 to 14. This allows you to determine the specific pH value of a solution.