Question

help on number 3 here is lab we did

EXPERIMENT 19 An Analysis of Commercial Antacids Rolaids Alka Seltzer OBJECTIVES: Determine the per gram neutralizing ability of a commercial antacio Determine the per gram neutralizing ability of sodium bicarbonate Compare the effectiveness of several antacids. INTRODUCTION: "How do you spell relief two hecimie The parietal cells in the stomach secrete sufficient hydrochloric aci 0.10 M The flow of HCl increases when food enters the stomach and so acid secrete sufficient hydrochloric acid to normally keep the acidity at about enters the stomach and so acidity increases when you eat or drink. If overstimulation of gastric juices builds the concentration up too much, heart indigestion often results. Sodium bicarbonate ( NaHCO, in baking soda) has historically e bicarbonate (NaHCO, in baking soda) has historically been used to try to relieve this condition. Today we have a number of commercial products which purport dave a number of commercial products which purport to neutralize (or buffer) excess stomach acid. Television commercial claimine greater effectiveness in neutralizing acid are familiar. Rolaids claims to consume 47 times its weight in excess stomach acid. to have one third more neutralizing power than other antacids In this lab, we will compare acid- neutralizing capabilities for ourselves. ve any commercials claiming excess stomac Several types of commercial antacids will be tested and the results will be shared in class. Keep in mind that tablets may also contain flavors, sweeteners, binders, fillers, antifoam agents, pain relievers, etc. In this experiment, the tablets will be analyzed only for their ability to neutralize acids. The active ingredient in antacids varies with the brand. The table below lists active ingredients in several brands. COMMERCIAL ANTACIDS' MAJOR ACTIVE INGREDIENTS Brand Active Agent red acid Milk of Magnesia Mg(OH). Rolaids NaAl(OH),CO, yellow base Tums Caco, Alka-Seltzer II NaHCO, and KHCO, Maalox Mg(OH), and Al(OH)2 Gaviscon Al(OH)3 20mah more The H (actually H,O) from acids are neutralized by these agents as illustrated below: insoluble carbonates: CaCO3(s) + 2 H (aq) —> Ca (aq) + H2O(l) + CO2(g) soluble bicarbonates: HCO, (aq) + H (aq) —> H,00) + CO2() insoluble hydroxides: Mg(OH),(s) + 2 H (aq) —> Mg(aq) + 2 H2O(1)

Answer 1

(A) If some solid ( powder) adhere to glass rod that mean some antacid is adhered, so number of moles of HCl will less neutralize by antacid. Finally antacid neutralizing capacity will decrease.

(B) Now it will consume less NaOH, so excess moles of HCl will be less. It will increase neutralizing capacity.

(C) Now more NaOH will be in calculation. It will decrease excess moles of HCl. Finally antacid neutralizing capacity will decrease.

(D) Now we have less excess acid, less NaOH will require. It will increase neutralizing capacity.

(E) it will not change neutralizing capacity of antacid.