To balance the chemical equation for the reaction between calcium hydroxide and hydrochloric acid, we need to make sure that the number of atoms of each element is the same on both sides of the equation. The given equation is:Ca OH 2 + HCl -> CaCl2 + H2OFirst, we can see that there are 2 chlorine atoms on the right side of the equation, but only 1 on the left side. To balance the chlorine atoms, we need to add a coefficient of 2 in front of HCl:Ca OH 2 + 2HCl -> CaCl2 + H2ONow, let's check the balance of the other elements:- Calcium Ca : There is 1 calcium atom on both sides of the equation, so it is balanced.- Oxygen O : There are 2 oxygen atoms on both sides of the equation, so it is balanced.- Hydrogen H : There are 4 hydrogen atoms on the left side 2 from Ca OH 2 and 2 from 2HCl and 4 hydrogen atoms on the right side 2 from H2O , so it is balanced.The balanced chemical equation is:Ca OH 2 + 2HCl -> CaCl2 + 2H2O