## waheguru 3 years ago Aluminum hydroxide + calcium  =

1. waheguru

I am just confused on one thing. Is the Aluminum Hydroxide writted in a chemical equation as AlOH or is is Al(OH)3(small 3)

2. waheguru

When an equation, any equation is written the elements must be compounded right and so Al(OH)3 should be correct?

3. jim_thompson5910

according to this page http://en.wikipedia.org/wiki/Aluminum_hydroxide it's $$\Large \text{Al(OH)}_{3}$$

4. waheguru

Yes, because it is unpossible for the compound to our without the 3 OH's

5. waheguru

I have one more question

6. Carl_Pham

Aluminum essentially always has an oxidation state of +3, because it loses control of its 3 valence electrons, so it would be Al(OH)3.

7. waheguru

I am learning how to predict the type of reaction when certain elements and compounds are put together, i have a question --- water reacts to form ...--- and i have to predict the type of reaction - what type whould it be

8. Carl_Pham

As for the reaction, calcium is more active metal than aluminum: Al(s) -> Al+3(aq) + 3e E0 = -1.66V Ca(s) -> Ca+2(aq) + 2e E0 = -2.87V So...in principle the calcium can reduce the aluminum: 3 Ca(s) +2 Al(OH)3 -> 3 Ca(OH)2 + 2 Al(s)

9. waheguru

Thanks Guys