What is the chemical combination of calcium cloride and aluminum ​

You may expect bonds between two atoms which each have n covalent lonic metallic hydrogen

Can someone me with questions 12 and 13 plz.

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?