124 2. Write the balanced total reaction that would occur when the antacid Alka-

Question

124 2. Write the balanced total reaction that would occur when the antacid Alka-2 (AI(OH neutralizes stomach acid (HCl (aq)· l.net ionie reaction. Iraq) OH(aq) Ho + What volume of fluid would be delivered from the buret shown in the figure if the meniscus moves from its initial location to its final location? The larger units shown are milliliter units. Use the correct number of significant figures 3. 0 Initial location ofthe meniscus mL 2 mL Final location of the meniscus mL 49 50 What is the purpose of adding a substance like the modified methyl orange indicator to the partially neutralized HCl solution before the sodium hydroxide solution is added? 4.

Explanation / Answer

2. Balanced total reaction can be written by first identifying the reactants and products.

Al(OH)3 + HCl AlCl3 + H2O

Then adjusting the coefficients to obtain the same number of atoms on both sides of the reaction.

Al(OH)3 + 3 HCl AlCl3 + 3 H2O

Finally identify the states of matter of each compound in the equation

Al(OH)3 (aq) + 3 HCl (aq) AlCl3 (aq) + 3 H2O (l)

Writing the reaction in ionic form

Al3+ (aq) + 3OH- (aq) + 3 H+ (aq) + Cl- (aq) Al3+ + 3Cl- (aq) + 3 H2O (l)

By cancelling out the common ions we get the net ionic reaction as

3OH- (aq) + 3 H+ (aq) 3 H2O (l)

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