Me: sucks that I’m an online learner with zero knowledge and 53+ absences as a SENIOR with straight F’s and FOUR math classes I got you;)

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?