I need help setting up the last two parts of this problem. I do not want the ans

Question

I need help setting up the last two parts of this problem. I do not want the answer, just to understand how to set it up and why.

Sodium hydrogen carbonate, NaHCO3 is a base used in several commercial antacids. The overall reaction with HCl is: NaHCO3(aq) + HCl(aq) NaCl (aq) + H20 (l) + CO2 (g) 1. A tablet, which had a mass of 1.213 g, was pulverized and 0.613 g were dissolved in 25.00 mL of 0.220 M HCl. The titration of this solution with 0.1615 M NaOH required 26.30 mL to reach the phenolphthalein end.point. Determine the moles of HCl that were added to the sample analyze I found this answer to be.00550 mol 2. For the previous problem, determine the moles of HCl that reacted with the NaOH. I found this answer to be 0.00425 mol These last two are where I am stuck and don't know how to set up the problem. I don't want the answer, I just want help understanding how to set it up. 3. Determine the grams of NaHCO3 in the sample analyzed. 4. Determine the mass of NaHCO3 in the tablet.

Explanation / Answer

3. According to the stoichiometry of the equation, one mole of NaHCO3 requires one mole of HCl. Total moles of HCl is known, moles used by the sample can be calculated and hence you calculate the moles and therefore the mass of NaHCO3.

moles= given wt./ Molecular wt.

4. this can be done using simple unitary method, if x gm (calculated in 3.)is present in 0.613g of the tablet then (x* 1.213/0.613) g is present in the tablet.

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