Write the balanced chemical equation for the neutralization reaction between Ca(OH)2 and HCl. Include phases.

Suppose that you are performing a titration of a hydrochloric acid solution of unknown concentration using a standardized solution of 0.052 M Ca(OH)2. You prepare the analyte solution by adding 10.0 mL of the unknown hydrochloric acid solution, 40.0 mL of water, and 2 drops of phenolphthalein to an Erlenmeyer flask. You discover that it takes 23.45 mL of Ca(OH)2 to reach the endpoint. What is the concentration of the unknown HCl solution?

HCl concentration:

M