Answer is: the maximum concentration of Pb²⁺ is 6.8·10⁻³ M.
Chemical reaction 1: PbCl₂(s) → Pb²⁺(aq) + 2Cl⁻(aq).
Chemical reaction 2: NaCl(aq) → Na⁺(aq) + Cl⁻(aq).
Ksp(PbCl₂) = 1.7·10⁻⁵.
c(NaCl) = c(Cl⁻) = 0.0500 M.
Ksp(PbCl₂) = c(Pb²⁺) · c(Cl⁻)².
c(Pb²⁺) = Ksp(PbCl₂) ÷ c(Cl⁻)².
c(Pb²⁺) = 1.7·10⁻⁵ M³ ÷ (0.0500 M)².
c(Pb²⁺) = 0.000017 M³ ÷ 0.0025 M².
c(Pb²⁺) = 0.0068 M = 6.8·10⁻³ M.
If they are constantly being formed then, they are called renewable energy. So the statement above is false. B.
Answer:
A
Explanation:
Clear glass reflects light, but frosted glass absorbs light.
The density of vldl is 1.152 mg/l
Calculation:
Given mass = 0.288 mg
Given volume = 0.252 ml
From the formula
Density = Mass/ volume
= 0.288 / 0.252
= 1.152 mg/l
The density of a substance (volumetric mass density or specific mass) is its mass per unit volume. The most common symbol for density is (the lower case Greek letter rho), but the Latin letter D can also be used. Density defined mathematically
p = mass / volume
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