Question

It takes 45.66 mL of 0.1126 M HBr to titrate 25.00 mL of Ca(OH)2 to its equivalence point. Write the balanced equation for this chemical reaction and calculate the original concentration of the Ca(OH)2 solution in detail.

Answer 1

The balanced equation for the chemical reaction between HBr and Ca(OH)2 is Ca(OH)2 (aq) + 2HBr (aq) → CaBr2 (aq) + 2H₂O (l). The original concentration of the Ca(OH)2 solution is 0.028 M.

Step-by-step explanation:

The balanced equation for the chemical reaction between HBr and Ca(OH)2 is:

Ca(OH)2 (aq) + 2HBr (aq) → CaBr2 (aq) + 2H₂O (l)

To calculate the original concentration of the Ca(OH)2 solution, we can use the equation:

M1V1 = M2V2

Where M1 is the initial concentration of Ca(OH)2, V1 is the volume of Ca(OH)2 solution, M2 is the concentration of HBr, and V2 is the volume of HBr solution.

Using the given values, we can plug them into the equation and solve for M1:

(0.0100 M)(125 mL) = (0.1126 M)(45.66 mL)

Solving for M1, we find:

M1 = 0.028 M