Question

if we add water to a base what will happen ? will it affect the pH?

Answer 1

Solid NaOH consists of Na+ and OH- ions packed into a crystalline lattice. When this solid is added to water, the ions float apart leading to extra OH- ions in the water: NaOH → OH- + Na+. The resulting large concentration of OH- makes the solution more basic and leads to a dramatic increase in the pH. 
If we add a strong acid or strong base to water, the pH will change dramatically.

Answer 2

YES. PH WILL CHANGE. WATER IS NEITHER ACIDIC NOR IS BASIC. IT IS NEUTRAL. IF WE ADD A BASE TO WATER. IT WILL BECOME A BASIC SOLUTION. THE PH OF A BASE LIES BETWEEN 8 -14. SO THE PH WILL LIE BETWEEN THESE 2 NOS. ONLY.
BUT ALSO IT DEPENDS ON WHAT KIND OF WATER UR TAKING. I AM TALKING ABOUT PURE OR DISTILLED WATER. BUT IF U TAKE TAP WATER IT MAY BE ACIDIC OR BASIC . THERE MAY BE MANY THINGS ADDED TO IT. SO IF IN THIS CASE WE ADD A BASE TO IT, THE READING WILL SURELY CHANGE BUT WE ARE NOT SURE HOW IT WILL CHANGE.