Question

How do I balance this chemical reaction ?

Answer 1

Ignore my writing answer is in pictute

Answer 2

As + NaOH --------- Na3AsO3 +H2

This is how i do it.

original equation :
As  - 1                     As -1
Na  - 1                  Na - 3
O - 1                     O- 3
H - 1                     H -2     As we can see they are obviously not balanced. so we have to manipulate it so it can equal.

new balanced equation:

2As + 6NaOH ------>>>  2Na3AsO3 + 3H2

As - 1(2) = 2              As - 1(2) = 2
Na - 1(6) = 6              Na - 3(2) = 6
O -1(6) = 6                  O - 3(2) = 6
H - 1(6) = 6                 H - 2(3) = 6       As we can see, both sides are balanced

I hope this makes sense :)