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madreJ [45]
3 years ago
10

In the reaction K2CrO4(aq) + PbCl2(aq) → 2KCl(aq) + PbCrO4(s), how many grams of PbCrO4 will precipitate out from the reaction b

etween 500.0 milliliters of 3.0 M K2CrO4 in an excess of PbCl2?
Chemistry
2 answers:
svetoff [14.1K]3 years ago
8 0

A.  

1.5 grams

B.  

3.0 grams

C.  

480 grams

D.  

150 grams

are the answer choices...

Ostrovityanka [42]3 years ago
6 0
V=500.0 mL = 0.5 L
c=3.0 mol/L
M(PbCrO₄)=323.2 g/mol

m(PbCrO₄)=M(PbCrO₄)n(PbCrO₄)

m(PbCrO₄)=M(PbCrO₄)n(K₂CrO₄)=M(PbCrO₄)vc

m(PbCrO₄)=323.2*0.5*3.0=484.8 g
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Calculate the concentration of all species in a 0.160 m solution of h2co3.
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I            0.160               0                 0

C            -x                  +x               +x

E          0.160-x          +x                +x

Ka1 = [HCO₃⁻][H⁺] / [H₂CO₃]

4.3 x 10⁻⁷ = x² / (0.160-x)   (x is neglected in 0.160-x = 0.160)

x² = 6.88 x 10⁻⁸

x = 2.62 x 10⁻⁴

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I          2.62 x 10⁻⁴               0                2.62 x 10⁻⁴

C          -x                            +x              +x

E       2.62 x 10⁻⁴ - x           +x              2.62 x 10⁻⁴ + x

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x = 5.6 x 10⁻¹¹

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[OH⁻] = 3.8 x 10⁻¹¹

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