- How to determine the solubility product of Ca(OH)2 during the experiment with HCl?

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What is the oxidation number of iron and sulfur for FeSCN+2? Is this a group, according to the group axioms? (R*, ◦), where x ◦ y = πxy? How many electrons in n=6, l=1,ml=-1? Find the value of c so that x-5 is a factor of the polynomial p(x).
p(x)=x^3+2x^2+cx+10? Help, double integrals, I cant get answer:
∫[from 0 to infinity] (tan−1(5x)−tan−1(2x))/(x) dx. I got:
∫[from 2 to 5] (1/(1+(xy)^2)) dy.?