1. a substance with a ph of 3 2. a substance with a ph of 10 3. a substance with a ph of 7 4. an indicator 5. a scale that represents the concentration of h30+, 0-14 a.) phenolphthalein b.) base c.) ph scale d.) neutral e.) acid

1. a substance with a pH of 3: acid  

2. a substance with a pH of 10:  base

3. a substance with a pH of 7: neutral

4. an indicator: phenolphthalein  

5. a scale that represents the concentration of , 0-14: pH scale

Explanation:-

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration and pOH is calculated by taking negative logarithm of hydroxide ion concentration.

On the pH scale ranging from 0 to 14 , Acids have pH ranging from 0 to 6.9, bases have pH ranging from 7.1 to 14 and neutral solutions have pH equal to 7.

Indicators show a change or appearance in color at particular pH. Phenolphthalein is one such acid base indicator which shows pink color in basic solutions and colorless in acidic solutions.

atomic = no of protons.

mass number-atomic number = neutron number