A change in pH of 1.0 unit indicates that:. 1. the molarity of H changes by one order of magnitude.
2. the volume of H in a solution changes by an order of magnitude.
3. the acid or base content decreases or increases by 1.0 M.
4. the acid or base content decreases or increases by 0.1 M.
5. the salt content decreases or increases by 1.0 M.

The correct answer is - option 1. the molarity of H changes by one order of magnitude.

Explanation:

pH is dependent on the concentration of H+ not on the volume of H+ or the salt content.  The molarity of H+ changes by one order of magnitude with the change in pH of 1.0 unit that can be an increase or decrease in molar concentration by one order of magnitude or factor of 10.

Order of magnitude refers to the factor of ten or powers of ten. A change in the order is equal to the change of the exponent changes by ± 1

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation: