# Acid / Base Indicators

A.

An acid/base indicator is red when the molarity of hydronim ion is less than 1.0x10^-8 and yellow when the molarity of hydronium ion is greater than 1.0x10^-6. What will the color of this indicator be in a solution of pH = 5.0?

B.

How many grams of NaOH are there in 3.00L of a 1.00M solution?

https://brainmass.com/chemistry/acids-and-bases/acid-base-indicators-23387

#### Solution Preview

A. For this question you need to familiarize yourself with a few concepts, and a few quick conversions.

pH = -log[H+]

10^(-pH) = [H+]

When the question gives us the pH, ...

#### Solution Summary

This solution has a formula ready for each part of the question on acid and base indicators which leads to the colour of an indicator in the described solution of hydronium ions and then the grams of sodium hydroxide in a solution.

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