Write the balance formula unit equation for the acid-base reaction of calcium hy

Question

Write the balance formula unit equation for the acid-base reaction of calcium hydroxide and hydrobromic acid. 1. What is the the chemical formula of the salt formed in this reaction? 2. If 24.01 mL of 0.110 M calcium hydroxide solution are reacted with 40.62 mL of 0.508 M hydrobromic acid, what is the molar concentration of the salt solution formed in this reaction? 3. what is the molar concentration of the excess reactant once this reaction has finished?

Explanation / Answer

Ca(OH)2 + 2HBr ---> 2H2O + CaBr2 1) CaBR2 2) 24.01 x0.11/1000 = 0.00264 moles Ca(OH)2 , 40.62 x0.508/1000 = 0.02 moles HBr moles of CaBr2 = 0.00264x2 = 0.00528 moles , [CaBr2] = 0.00528 x1000/(40.62+24.01) [CaBr2] = 0.0817 3) excess HBr moles = 0.02- 0.00264 = 0.01736 moles excee [HBr] = (0.01736 x1000/40.62+24.01) = 0.268 M

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