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Sodium hydroxide reacts with aluminium and water to release hydrogen gas. The aluminium takes an oxygen atom from sodium hydroxide, which in turn takes an oxygen atom from water, and releases two hydrogen atoms. The reaction thus produces hydrogen gas and sodium aluminate. In this reaction, sodium hydroxide acts as an agent to make the solution ...
- NaOH
- 39.9971 g/mol
- 323 °C (613 °F; 596 K)
- 418 g/L (0 °C), 1000 g/L (25 °C), 3370 g/L (100 °C)
How to carry out tests for metal ions and ammonium ions using aqueous sodium hydroxide. Expected results and videos included.
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Which metal ions can be detected by sodium hydroxide test?
Can a sodium hydroxide test detect cations in a precipitate?
What is a sodium hydroxide test?
Sodium Hydroxide Test for Cations. Add several drops of sodium hydroxide (NaOH) solution to the solution being tested. If a colored precipitate is formed then stop and find out what the cation is. If white precipitate forms then continue to add NaOH to it and observe whether the precipitate dissolves.
Apr 15, 2024 · 2 NaCl (aq) + 2 H₂O (l) → 2 NaOH (aq) + Cl₂ (g) + H₂ (g) In this reaction, chlorine gas (Cl₂) is released at one electrode (anode), and hydrogen gas (H₂) is released at the other electrode (cathode), while sodium hydroxide remains in solution.
The sodium hydroxide test works thanks to a precipitation reaction. Sodium hydroxide (NaOH) dissolves in solution to form sodium ions (Na+) and hydroxide ions (OH-). The hydroxide ions react with dissolved cations to form an ionic hydroxide salt, which precipitates out of solution.
Chemistry. Metal Hydroxides. Metal ions in aqueous solution can be identified by the colour of the precipitate they form on addition of sodium hydroxide. If only a small amount of NaOH is used then normally the metal hydroxide precipitates. In excess NaOH, some of the precipitates may dissolve.
Sodium hydroxide is employed in the production of other sodium compounds and is used to neutralize acidic solutions during the production of other chemicals such as petrochemicals and polymers. Many of the applications of hydroxides are for the neutralization of acids (such as the antacid shown in Figure 18.46 ) and for the preparation of ...
