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7 votes
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Searching for liquids with a high boron density

Easiest to try might be sodium tetraborate, $\ce{Na2B4O7ยท10H2O}$ (borax), which is more soluble in water at room temperature (31.7 g/L) than boric acid, if the sodium will not interfere with your work....
DrMoishe Pippik's user avatar
5 votes

White powder-like substance on top of sodium hydroxide solution

It should be sodium carbonate. Sodium hydroxide, solid or dissolved, is the trap for aerial carbon dioxide. $$\ce{2 NaOH(s,l) + CO2(g) -> Na2CO3(s,aq) + H2O(l)}$$ The carbonate presence in ...
Poutnik's user avatar
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2 votes

White powder-like substance on top of sodium hydroxide solution

Citing the entry in Perrin about solid anhydrous sodium hydroxide, p. 349: Common impurities are water and sodium carbonate. Sodium hydroxide can be purified by dissolving 100g in 1L of pure EtOH, ...
Buttonwood's user avatar
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