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 ...
- 22.8k
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,...
- 32.8k
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 ...
- 22.6k
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 {\...
- 29.9k
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