Answer:
Yes ,The base neutralize all of the acid because it(base) is present in excess quantity .
Mg(OH)2 is in excess by 0.205 mole
Explanation:
The balanced equation is :
<u>Calculate the moles of Hydrochloric Acid and Magnesium hydroxide</u>
<u>For HCl</u>
Given mass = 20.0 g
Molar mass of HCl = 36.5 g/mol
<em>mole of HCl</em> = <em>0.55 </em>
<u>For Mg(OH)2</u>
Given mass = 28.0 g
Molar mass of Mg(OH)2 = 58.3 g/mol
<em>mole of Mg(OH)2 = 0.48</em>
According to the balanced equation ,
1 mole of Mg(OH)2 would require = 2 mole of HCl for neutralisation
So,
0.48 mole of Mg(OH)2 would require = 2(0.48) = 0.96 mol
<u>HCl needed for complete neutralisation = 0.96 mole</u>
<u>Available HCl = 0.55 mole</u>
HCl is less by = 0.96 -0.55 = 0.41 mole
So,
Mg(OH)2 is in excess by = 0.41/2 mole [because <u>1</u> HCl =<u> 2</u> Mg(OH)2]
= 0.205
Here HCl is less than need and Mg(OH)2 is in excess.