Percent of Light Intensity on Moon Visible through Lunar Cycle
Intensity
100
76
50
25
Lunar Cycle
O waxing gibbous
waning crescent
O waning gibbous
O waxing crescent

Achemistry student weighs out of phosphoric acid , a triprotic acid, into a volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with solution. calculate the volume of solution the student will need to add to reach the final equivalence point. round your answer to significant digits.

The answer for #3 is c but i don't know why

What are the primary responsibilities of a chemical engineer involved in "r& d"? develop large scale manufacturing operations discover new products and processes training of new chemists determine products needed by consumers