Print Calculator Periodic Table Question 24 of 24 Map pling Determine the concen

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Print Calculator Periodic Table Question 24 of 24 Map pling Determine the concentrations of K2SO4, K*, and so4 n a solution prepared by dissolving 1.69 x 10 4 g K2SO4 in 1.50 L of water. Express all three concentrations in molarity. Additionally, express the concentrations of the ionic species in parts per million (ppm). Note: Determine the formal concentration of SO gnore any reactions with water. Number M Number ppm Number Number I- O ppm SO O Previous Check Answer Next Give Up & View Solution Ext Hint

Explanation / Answer

we know that

moles = mass / molar mass

so

moles of K2S04 = 1.69 x 10-4 / 174.259

moles of K2S04 = 9.70 x 10-7

now

concentration = moles / volume (L)

so

[K2S04] = 9.7 x 10-7 / 1.5

[K2S04] = 6.4667 x 10-7 M

now

K2S04 --> 2K+ + S042-

we can see that

[K+] = 2 x [K2S04]

[K+] = 2 x 6.4667 x 10-7

[K+] = 1.2933 x 10-6 M

now

conc of K+ in g / L = [K+] x molar mass

conc of K+ in g / L = 1.2933 x 10-6 x 39

conc of K+ in g / L = 5.044 x 10-5

conc of K+ in mg / L = 0.05044

we know that

1 mg / L = ppm

so

[K+] = 0.05044 ppm

now

[S042-] = [K2S04] = 6.4667 x 10-7 M

conc of S042- in g / L = 6.4667 x 10-7 x 96

conc of S042- in g / L = 6.21 x 10-5

conc of S042- in mg / L = 0.062

so

[S042-] = 0.062 ppm

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