Question

Fill in the products (including states) for each pair of reactants and balance the equation. Explain...

Fill in the products (including states) for each pair of reactants and balance the equation. Explain how you got each answer.

A. ___ H2SO4(aq) + ____ LiOH(aq) —> ________ + _________
This is an acid based reaction

B. ___ Na(s) + ___ O2(g) —> _______
This is an oxidation/reduction reaction

C. __ NaOH(aq) + __ FeCl3 —> _________ + ________
This is a perception reaction

D. __ HCl(aq) + __ Na2S(aq) —> _______ + _______
This is a gas evolving reaction
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Homework Answers

Answer #1

A.

H2SO4(aq) + LiOH(aq) Li2SO4(aq) + H2O(l)

LHS: 3H, 1S, 5O, 1Li
RHS: 2H, 1S, 5O, 2Li

Multiply LioH by 2 and H2O by 2

The Balanced equation is

H2SO4(aq) + 2LiOH(aq) Li2SO4(aq) + 2H2O(l)

LHS: 4H, 1S, 6O, 2Li
RHS: 4H, 1S, 6O, 2Li

B.

Na(s) + O2(g) Na2O(s)

The balanced equation is

4 Na(s) + O2(g) 2Na2O(s)

The reason is simply that there are 2 Na atoms for each O atom, but since you started with 2 oxygens you need to maintain that ratio by multiplying the right side by 2 and that gives you 4 Na atoms.

(C)

NaOH(aq) + FeCl3(aq)   Fe(OH)3(s) + 3NaCl(aq)

The balanced equation is

3NaOH(aq) + FeCl3(aq)   Fe(OH)3(s) + 3NaCl(aq)

Fe(OH)3(s) is the percepitate.

(D)

Na2S (aq) + HCl (aq) NaCl (aq) + H2S(g)

The balanced equation is

Na2S (aq) + 2 HCl (aq) ​ 2 NaCl (aq) + H2S(g)

H2S(g) is the gas

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