1. If a solid sample of Al(OH) 3 is titrated with HI(aq) what is the sum of the

Question

1. If a solid sample of Al(OH)3 is titrated with HI(aq) what is the sum of the coefficients of the balanced chemical equation for this titration? Write the equation in molecular form to determine the coefficients..

Select one:

a. 6

b. 3

c. 5

d. 8

e. 4

2.  

An unknown solid acid has a formula H2X. How could you determine the molar mass of the unknown acid for a titration with 0.455 M KOH using phenolphthalein indicator?

Select one:

a. Dissolve known mass of acid in water and titration with KOH noting a 1:2 acid to base ratio.

b. Add solid to known volume of the KOH solution using 2:1 acid to base ratio.

c. Add solid to known volume of the KOH solution using 1:2 acid to base ratio.

d. Dissolve known mass of acid in water and titration with KOH noting a 2:1 acid to base ratio.

e. Dissolve known mass of acid in water and titration with KOH noting a 1:1 acid to base ratio.

Explanation / Answer

1) Al(OH)3 + 3HI -----------> AlI3 + 3H2O

total coefficients = 1 + 3 + 1 + 3 = 8

.answer = option d = 8

2) answer = option a =  Dissolve known mass of acid in water and titration with KOH noting a 1:2 acid to base ratio.

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