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Neutralization of Antacid A. Standardization ofNaoH Molarity of HCI M Initial re

ID: 511534 • Letter: N

Question

Neutralization of Antacid A. Standardization ofNaoH Molarity of HCI M Initial reading of HCI Final reading ofHCI Volume of HCI Initial reading of NaOH Final reading of NaOH Volume of NaOH Molarity of NaoH (eq. 20 Mean molarity of NaoH B. Back-Titration of Antacid Mass of antacid powder Initial reading of HCI Final reading ofHCI Volume of HCI Initial reading ofNaoH Final reading of NaOH Volume of NaOH H" neutralized (eq. 1) Caco (in Tums) neutralized (eq. 3) Molar mass of Caco, Mass of CaC0, CaCO Trial 3 Trial 2 Trial 1 U.21 mL 20.18 mL, 04 Trial 2 Trial 1 50 LIU 40 mL. mL 75.0 25.3a l 2, 34 .02. mmol mmol mmol mol grmol 9%

Explanation / Answer

Volume of NaOH :

in trial 1 : V = 13.34 mL

in trial2 : V = 16.02 mL

Moles of NaOH used :

in trial 1 =0.094 M * 0.01334 L = 1.25*10^-3 moles

in trial 2 = 0.094 M * 0.01602 L = 1.51*10^-3 moles

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H+ neutralized in

Trial 1 : 1.25 mmoles

Trial 2 : 1.51 mmoles

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mmoles of CaCO3 in

Trial1 :1.25 mmol

Trial2 : 1.51 mmol

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Molar mass of CaCO3 = 100gm/mol

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Mass of CaCO3 :

Trial 1 = 1.25 *10^-3 mol *100 g/mol = 0.125 gm

Trial 2 = 1.51 *10^-3 *100g/mol = 0.151 gm

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% mass of CaCO3

trial 1 : (0.125 g/0.503) *100% = 24.85 %

trial2 : (0.151/0.705) *100 % = 21.42 %