How long would it take to consume 13 mg of magnesium in 4.2 mL of 1.25 M HCl? Explain.

Answer 1

Mg+2HCl>>MgCl2+H2 neglecting the water in the acid.

moles Mg: .013/26=.005moles
Moles HCL=.0042*1.25=.00525moles

Well, you need twice as many moles of HCL in the balanced equation than moles Mg, so the reaction will never complete, not enough HCl.

Answer: how long will it take? Till Kingdom come.