Chromium chloride(CrCl3) reacts with NaOH và giveschromium hydroxide (Cr(OH)3) andsodium chloride (NaCl). Chromium hydroxide is a green colour precipitate. In the presence of excess NaOH,Cr(OH)3 is dissolved và give a green colour solution. Colour changes, precipitation and morecharacteristics of chromium chloride & 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 to lớn Cr3+ and Cl- ions. As well as, NaClreadily 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 witheach other, green colour precipitate,chromium hydroxide và sodium chloride is given as products.

Adding NaOH crystals lớn CrCl3 solution

You can see the exact results as mixing aqueous NaOH & aqueous CrCl3 when NaOH crystals are addedto aqueous CrCl3.

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

Balanced equation of chromium chloride và 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 & 3 mol of NaCl. ExceptCr(OH)3, all other compounds exist as aqueous state in the equation. Cr(OH)2 exists in solid state.Remember that, to lớn write physical states of compounds when you write the balanced equation.

Observations during the CrCl3 and NaOH reaction

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

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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 anamphoteric hydroxide.Therefore, chromium hydroxide precipitate will dissolve in excess NaOH và give tetrahydroxochromate(III) ion, acoordination complex anion.

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

Questions asked by studentsAsk your question và find theanswer 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 to lớn know whether can I separate CrCl3 và FeCl2 solutions from NaOH?

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

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