What volume of 0.0200 m calcium hydroxide?

The molarity is the number of moles of solute dissolved in one liter of solvent. It is calculated using the formula M = n/V. To find the volume we have to specify the number of moles dissolved to get the required molarity concentration which is 0.200 m. 

Calcium hydroxide may be used in the process of titration with acids to get a neutral solution and determine the unknown concentration of the acid. In such case we use the following formula;
M1V1 = M2V2
M1 is the molarity of CaOH
V1 is the volume of CaOH
M2 is the molarity of the acid
V2 is the volume of the acid