Chem 171 F09 Q8 Tit Antacid Key

Chem 171 F09 Q8 Tit Antacid Key - 1. Chem 171 Quiz 8...

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Chem 171 Quiz 8 Version A 1. What is the molarity of an HCl solution if 22.5 mL of a 0.100 M NaOH solution are needed to titrate a 25.0 mL sample of the acid? Write the molecular equation. What is the normality of HCl solution? HCl (aq) + NaOH (aq) Æ NaCl (aq) + H 2 O(l) 0.0225 L x 0.100 mol NaOH / L = 0.00225 mol NaOH 0.00225 mol NaOH = 0.00225 mol HCl 0.00225 mol HCl / 0.0250 L = 0.0900 M HCl 0.0900 M HCl = 0.0900 N HCl 2. The following question pertains to the lab entitled “Evaluating Commercial Antacids”. Write the molecular equation, for the neutralization of magnesium hydroxide, a typical antacid. Show phases. Write the molecular equation for the neutralization of calcium carbonate, a typical antacid. Show the phases. Write the molecular equation for neutralization of sodium bicarbonate a typical antacid. Show the phases. Mg(OH) 2 (s) + 2 HCl (aq) MgCl 2 (aq) + 2 H 2 O (l) CaCO 3 (s) + 2 HCl (aq) CaCl 2 (aq) + CO 2 (g) + H 2 O (l) HCl(aq) + NaHCO 3 (aq) NaCl(aq) + CO 2 (g) + H 2 O (l) Chem 171 Quiz 8 Version B 1. Acid rain is caused by the presence of dissolved acids such as H 2 SO 4 . What is the molarity of H 2 SO 4 in rainwater if 5.22 mL of a 0.20 M NaOH solution are needed to titrate 125 mL of the sample? Write the balanced molecular equation. What is the normality of H 2 SO 4 solution? H 2 SO 4 (aq) + 2 NaOH (aq) Na 2 SO 4 (aq) + 2H 2 O (l) 0.00522 K x 0.20 mol NaOH / L = 0.0010 mol NaOH 0.0010 mol NaOH x 1 mol H 2 SO 4 / 2 mol NaOH =0.00050 mol H 2 SO 4 0.00050 mol H 2
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Chem 171 F09 Q8 Tit Antacid Key - 1. Chem 171 Quiz 8...

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