# Zncl2 + naoh = zn(oh)2 + nacl

Aqueous zinc chloride (ZnCl2) reacts with aqueous sodium hydroxide (NaOH) to lớn produce zinc hydroxide ( Zn(OH)2 ) và sodium chloride (NaCl). Zinc hydroxide is a white colour precipitate và it is also an amphoteric hydroxide. Therefore, zinc hydroxide is dissolved when excess NaOH is added to lớn the precipitate.

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## ZnCl2 + NaOH = Zn(OH)2 + NaCl

When both solutions are mixed, a white colour precipitate, zinc hydroxide ( Zn(OH)2 ) is formed. In aqueous phase, there are sodium ions, chloride ions, little bit of Zn2+ ions & OH- ions.

## Balanced equation of ZnCl2 + NaOH reaction

### ZnCl2 + 2NaOH = Zn(OH)2 + 2NaCl

From the balanced equation, we can say, 1 mol of zinc chloride reacts with 2 mol of sodium hydroxide và produce 1 mol of zinc hydroxide & 2 mol of sodium chloride.

## How khổng lồ balance the ZnCl2 and NaOH reaction?

This equation can be balanced easily from following steps.

ZnCl2 + NaOH = Zn(OH)2 + NaCl

There are two chlorine atoms in the left side. Therefore, khổng lồ make two chlorine atoms in the right side, make two NaCl as below. ZnCl2 + NaOH = Zn(OH)2 + 2
NaCl Now, there are two sodium atoms in the right side. Lớn make two sodium in the left side, make two NaOH. ZnCl2 + 2NaOH = Zn(OH)2 + 2NaCl

## ZnCl2 và excess NaOH

Remember that zinc is an amphoteric element and zinc hydroxide is an amphoteric hydroxide.

When aqueous NaOH is added to ZnCl2 solution drop by drop, at one time, Zn(OH)2 precipitate is formed. If you địa chỉ more aqueous NaOH to the solution which contains the precipitate, precipitate is dissolved và give a colourless solution due to lớn formation of sodium zincate (Na2ZnO2). Sodium zincate is a colourless aqueous solution.

### Zn(OH)2 + 2NaOH → Na2ZnO2 + 2H2O

Sometime above equation is written as below.

### After dissolving Zn(OH)2 precipitate in the excess NaOH, what will happen if I địa chỉ dilute HCl acid?

If you slowly địa chỉ cửa hàng HCl acid to the 2+, you can see a white precipitate is formed in the solution. That is zinc hydroxide precipitate. If you showroom more HCl acid, that white precipitate is also dissolved và give colourless ZnCl2 solution.

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### What will happen if little amount of ZnCl2 solution is added to large volume of aqueous NaOH?

Due to presence of excess NaOH, reaction will kết thúc up with soluble sodium zincate.

How vày I decide whether a precipitate is formed or not when NaCl và ZnCl2 solutions are mixed with each other?

Option 1: If you know the concentratins of each solution, you can bởi a calculation to check Ksp value related khổng lồ the Zn(OH)2.

In the final solution, if * 2 exceeds Ksp of Zn(OH)2, a precipiates is formed. When & are taken, you should assume that there is no precipiate and all Zn2+ và Cl- ions exist in aqueous solution.

### In the laboratory, I want to try this experiment. But, I could not find ZnCl2 in the lab. However, there was ZnO & other common chemicals. How vì I bởi vì the experiment from ZnO?

You can vày the experiment by starting from ZnO. Find dilute HCl bottle. Remember that it is good lớn use solid ZnO khổng lồ prevent any impurities. Measure the weight ZnO and put it in a beaker. Then slowly địa chỉ cửa hàng dilute HCl solution until all ZnO is dissolved. When all ZnO is dissolveed, ZnCl2 solution is given as the following reaction.

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ZnO + 2HCl → ZnCl2 + H2O

Now, you can continue the rest of the experiment with by adding NaOH lớn ZnCl2 solution.

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