ANAL063 Eartimating the Acld Nestral 4. A student used the Procedure of this exp

Question

ANAL063 Eartimating the Acld Nestral 4. A student used the Procedure of this experiment to analyze an antacid tablet co dissolving a 4 578 solution. After it 2-g tablet in water to which had cooled, she back-titrated the solution witho dded 25.00 ml, of 0. containing Ca her she a e2MNO,Ha Ge indicator. The beck-titration required 4.87 ml of the (a) Calculate the number of moles of HCI added to the dissolved tablet. hte (b) Calculate the number of moles of NaOH added in the back-titration (c) Calculate the number of moles of HCI neutralized by the NaOH in the back-titration (d) Calculate the number of moles of HCI neutralized by the antacid tablet. (e) Assuming that CaC0, is the only active ingredient in the tablet, express the acid-seutralizing capacity of the tablet in terms of the number of moles of CaCOs present. ) Express the acid-neutralizing capacity of the tablet in terms of the mass of Caco, present. (g) Express the acid-neutralizing capacity of the tablet in terms of mass percent of CaCo, in the tablet.

Explanation / Answer

Q4

a)

moles of HCl --> MV = 0.5984*25*10^-3 = 0.01496 mol of HCl

b)

moles of NaOH in backtitration = MV = (0.9982)(4.87*10^-3) = 0.004861

c)

mol oes HCl neutralized in backtitration

NAOH = HCl

so

mol of HCl neutralized = 0.004861

d)

moles of HCl by antacid = (0.01496 -0.004861) = 0.010099 moles used

e)

capacity in terms of CaCO3 present

CaCO3 + 2HCl = H2O + CO2 + CaCl2

0.010099 mol of HCl --> 1/2*0.010099 = 0.0050495 mol of CaCO3

f)

in terms of mass --> moles * MW = 0.0050495*100 = 0.50495 g

% Mass = 0.50495 / 4.5782*100 = 11.03 %

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