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CHEMISTRY!
Is this equation correct?
H2SO4 + Al(OH3 -> HOH + Al2(SO4)3
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Basically you count the atoms of, say, hydrogen on one side, and compare that number with the amount of hydrogens on the other side. If there are the same number of hydrogen, hydrogen on both sides is balanced. To balance an equation, you would do the same with each atom. When you find something that doesn't match up, you can change the amount of molecules.
For example, on the left side there is one Al. On the right there are two. To balance, add a two in front of Al(OH)3, to make it 2Al(OH)3. Now there are 2 Al, 6 O, and 6 H things on that side. Which means that you have to go to the other side and balance them out.
This is gonna be tricky the first few times, but eventually you'll get the hang of it, if you do enough problems.
As a side note, HOH turns into H2O in reactions. Basically, if doubly displacement yields any combo of Hs and Os, it turns into water.
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You can easily tell it's not balanced because you have one unit of SO_4 (the underscore indicates that the following number is a subscript) on the left and three on the right.
To balance the equation, start with the element that you have the most of, in terms of ions. (So, for example, SO_4 and OH count as one unit each.)
So, in this case, start with the SO_4. You have three of those on the right, so put a 3 in front of H_2SO_4.
After that, you have 3H_2SO_4 on the left, which gives you six Hs altogether. Look on the other side of the equation to see where you should add a coefficient to balance that. Remember that you can only add coefficients, not subscripts.
Have a go at the rest of it so you can learn how to do it yourself.
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In order to know if this equation is balanced and correct i must no which numbers are supposed to be the little ones that come at the bottom of the elements and which ones that are the coefficients. Once you make this clear we can balance it :)
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