6 votes
Accepted

Magnesium vs calcium vs barium ions from these 3 tests

The unfortunate thing is that salts of these ions are white and can't be differentiated by just looking. But you can take solubility to your advantage. The solubility of the sulfates of alkaline earth ...
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5 votes
Accepted

How does pH affect the rate that CaCO3 dissolves in freshwater?

Calcium carbonate dissolves by falling apart into ions (calcium cations and carbonate anions): $$\ce{CaCO3(s) <=> Ca^2+(aq) + CO3^2-(aq)}$$ The rate of dissolution does not depend on pH. However,...
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5 votes

Magnesium vs calcium vs barium ions from these 3 tests

Magnesium sulfate $\ce{MgSO4}$ is soluble in water. So when adding some dilute sulphuric acid $\ce{H2SO4}$ to the solution of magnesium sulphate, no precipitate should occur. It should occur with ...
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4 votes
Accepted

Is lead iodide a strong electrolyte?

Lead(II) iodide is sparingly soluble in water at room temperature $(\pu{0.76 g/L}$ at $\pu{20 °C})$ and a bit more soluble in hot water $(\pu{4.1 g/L}$ at $\pu{100 °C}).$ In solution, all of the lead ...
  • 32.8k
3 votes

Why phenolphthalein is not completely neutralized in basic solutions?

Depending of the weak acid $\mathrm{p}K_\mathrm{a}$, the degree of the acid neutralization $\alpha$ depends on $\mathrm{pH}$, following famous equation: $$\mathrm{pH} = \mathrm{p}K_\mathrm{a} + \log {\...
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