Lab 10: Titrating Vinegar 4. in solution commercially used to remove boiler The

Question

Lab 10: Titrating Vinegar 4. in solution commercially used to remove boiler The molar concentration of hydrochloric acid with reaction of NaOH with scale from plumbing can be determined by titration HCl is shown in Equation 7. (Eq. 7) NaCl(aq) HCl(aq) NaOH (aq) H20(l) Consider the following example. After we transfer sample of the HC1 solution into a 125-mL Erlenmeyer flask, we add 50 mL of distilled water and 3 drops of end point in solution. The resulting solution requires 44.00 mL of solution to reach the (1) Calculate the number of moles of NaOH required for the titration. (2) Calculate the number of moles of HCl in the HCl sample titrated. (3) Calculate the molarity of HCl in the boiler-scale removal solution.

Explanation / Answer

Ans 4.1)

Molarity = no. Of moles of NaOH/ volume of solution in L

0.1250 = n / 0.044

n = 0.0055 moles

So number of moles of NaOH = 0.0055 moles.

2) As you may see in the balanced reaction , an equimolar concentration of both acid and base are required for the titration reaction . So the number of moles of HCl will be equal to that of NaOH = 0.0055 moles.

3) Molarity = no. Of moles of HCl / volume of solution in L

Molarity = 0.0055 / 0.010

Molarity = 0.55M

So the molarity of HCl = 0.55M

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