Answer:
[Ca²⁺] = 0,00365M
[SO₄²⁻] = 0,00865M
Explanation:
The reaction:
CaSO₄(s) ⇄ Ca²⁺ + SO₄²⁻ has a Ksp of 10^-4.5 = 3,16x10⁻⁵ = [Ca²⁺] [SO₄²⁻] <em>(1)</em>
Concentrations are
[Ca²⁺] = X
[SO₄²⁻] = X
The addition of 5.00x10⁻³M of ions of SO₄⁻ gives a concentration of:
[Ca²⁺] = X
[SO₄²⁻] = (X + 0,005M)
Replacing in (1):
3,16x10⁻⁵ = X (X + 0,005M)
3,16x10⁻⁵ = X² + 0,005X
0 = X² + 0,005X - 3,16x10⁻⁵
Solving for X:
X = -0,00865M
X = 0,00365M
Thus, concentrations in equilibrium are:
[Ca²⁺] = 0,00365M
[SO₄²⁻] = 0,00365M + 0,005M = 0,00865M
I hope it helps!
Answer:
Explanation:
El porcentaje masa a masa de la solución se obtiene al dividir la masa del cloruro de sodio por la masa del agua (The mass-mass percentage of solution is obtained by dividing the mass of sodium chloride by the mass of water):
Answer:
C) Remove some of the water. Cover the rocks with an absorbent like kitty litter to remove the oil. Remove the dirty kitty litter. Add the water back.
Explanation:
Oil and water do not mix. The oil will cover the water's surface and anything in the water. So the best idea would be to absorb the oil from the system.
Answer:
C₃H₄O₄
Explanation:
In order to get the empirical formula of a compound, we have to follow a series of steps.
Step 1: Divide the percent by mass of each element by its atomic mass.
C: 34.6/12.01 = 2.88
H: 3.9/1.01 = 3.86
O: 61.5/16.00 = 3.84
Step 2: Divide all the numbers by the smallest one, i.e., 2.88
C: 2.88/2.88 = 1
H: 3.86/2.88 ≈ 1.34
O: 3.84/2.88 ≈ 1.33
Step 3: Multiply all the numbers by a number that makes all of them integer
C: 1 × 3 = 3
H: 1.34 × 3 = 4
O: 1.33 × 3 = 4
The empirical formula is C₃H₄O₄.
A solution may exist in any phase so your answer is D. any of the above
hope this helps :)
