Crcl2 + 2 naoh → cr(oh)2 + 2 nacl

     

Chromium chloride (CrCl3) reacts with NaOH & gives chromium hydroxide (Cr(OH)3) and sodium chloride (NaCl). Chromium hydroxide is a green colour precipitate. In the presence of excess NaOH, Cr(OH)3 is dissolved & give a green colour solution. Colour changes, precipitation & more characteristics of chromium chloride và sodium hydroxide reaction are explained in this tutorial.

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CrCl3(aq) + NaOH(aq) = Cr(OH)3(s) + NaCl(aq)

Chromium chloride is soluble in water & dissociates lớn Cr3+ and Cl- ions. As well as, NaCl readily dissociates to lớn Na+ và OH- ions in water.

Aqueous chromium chloride is a green colour solution và aqueous sodium hydroxide is a colourless solution. When they react with each other, green colour precipitate, chromium hydroxide và sodium chloride is given as products.

Adding NaOH crystals to CrCl3 solution

You can see the exact results as mixing aqueous NaOH và aqueous CrCl3 when NaOH crystals are added lớn aqueous CrCl3.

CrCl3(aq) + NaOH(s) = Cr(OH)3(s) + NaCl(aq)

Balanced equation of chromium chloride and sodium hydroxide reaction

CrCl3(aq) + 3NaOH(aq) = Cr(OH)3(s) + 3NaCl(aq)

1 mol of CrCl3 reacts with 3 mol of NaOH và produce 1 mol of Cr(OH)3 và 3 mol of NaCl. Except Cr(OH)3, all other compounds exist as aqueous state in the equation. Cr(OH)2 exists in solid state. Remember that, lớn write physical states of compounds when you write the balanced equation.

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Observations during the CrCl3 và NaOH reaction

When you are slowly adding one chemical to other chemical drop by drop, at one time, you will see a green colour precipitate is formed in the solution. If you suddenly địa chỉ one chemical khổng lồ another, green precipitate is also formed immediately and will be unavailable to detect precipitating moment.


In the presence of excess NaOH, what will happen lớn the green colour Cr(OH)3 precipitate?

Chromium hydroxide is soluble in excess sodium hydroxide because chromium hydroxide is an amphoteric hydroxide. Therefore, chromium hydroxide precipitate will dissolve in excess NaOH và give tetrahydroxochromate(III) ion, a coordination complex anion.

Cr(OH)3(aq) + NaOH(aq) = -(aq) + Na+(aq)

Questions asked by students

Ask your question and find the answer free.

What are the other 3 chiều metal cations which will give green precipitates with aqueous NaOH?

Nickel chloride can give a green colour Ni(OH)2 precipitate with NaOH. However, Ni(OH)2 is not soluble in the presence of excess NaOH such as Cr(OH)3. Therefore, we can distinguish Ni(OH)2 và Cr(OH)3 from excess NaOH.

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I want lớn know whether can I separate CrCl3 & FeCl2 solutions from NaOH?

Yes. You can see the precipitate given related to the CrCl3 solution will dissolve in excess NaOH. Fe(OH)2 is not soluble in aqueous NaOH.

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