Hydrochloric acid reacts with magnesium hydroxide forming wa

Hydrochloric acid reacts with magnesium hydroxide forming water and magnesium chloride. If 236 mg of magnesium chloride reacts, what is the volume (in L) of a 0.26 M hydrochloric acid solution that reacts

Solution

2HCl + Mg(OH)2 -------------------- MgCl2 + 2 H2O

2 mole    1 mole

mass of MgCl2 = 236 mg= 0.236 grams

molar mass of MgCl2= 95 gram/mol3

number of moles of MgCl2 = 0.236/95= 0.00248 moles

according to equaiton

1 mole of MgCl2 = 2 moles of HCl

0.00248 moles of MgCl2=?

                                  = 2x0.00248/1= 0.00496 moles of HCl

number of moles of HCl= 0.00496 moles

molarity of HCl= 0.26M

Molarity= number of moles/volume in L

Volume in L= number o fmoles/molarity

volume= 0.00496/0.26= 0.0191L

volume of HCl= 0.0191L