A pale of sand and water

Imagine that twenty i.u.’s of enzyme z were catalyzing the above reaction for one minute, under vmaxconditions, in a 3.00 ml assay volume. the assay is buffered with 20 mm phosphate buffer, ph 7.60. what will the ph be at the end of that one minute?

Which element is least likely to undergo a chemical reaction

Is it safe to take 450mg of diphenhydramine hydrochloride?