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It would be Ba(OH)2

For future reference; an easy way to figure out formulae of compounds is:

1. Find the charge of your atoms-unless you're doing higher level Chemistry then this should be given to you on a formula sheet (or at least it is in the UK)

2. If the charges are the same, leave them and just stick the letters together, eg. Na+ and Cl-, both have a charge of +/-1. So you just stick them together as NaCl. O2- and Ba2+ both have a charge of +/- 2, so you just stick them together as BaO.

3. If the charges are different, swap them. eg. Barium has a charge of 2+, Hydroxide of 1-, so you would just swap them as Ba(OH)2. Na has a charge of 1+, sulfide has a charge of 2-, so you would swap them as Na2S.

4. If you have any compound with two capital letters, eg. OH, PO4, NO3, CO3, you need to put any combining power (the tiny numbers) outside a set of brackets, eg. Ca3(PO4)2 (Ca has a charge of 2+, PO4 has a charge of 3-)

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Barium hydroxide is an ionic compound because it is composed of a metal (barium) and a non-metal (hydroxide ion). Ionic compounds are formed by the transfer of electrons from the metal to the non-metal.


What compound is formed by mixing a Barium ion plus a hydroxide ion?

When barium ion is added to a hydroxide ion, the two opposite charges attract each other to form barium hydroxide Ba2+ + OH------>Ba(OH)2.


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The compound formed by barium ions and chloride ions is known as barium chloride. The chemical formula for barium chloride is BaCl2, as barium has a 2+ charge and chloride has a 1- charge, requiring two chloride ions to balance the charge on one barium ion.


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The precipitate formed when barium chloride reacts with sodium hydroxide is barium hydroxide (Ba(OH)2).


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What is the formula for the compound formed by the barium ion Ba2 plus and the hydroxide ion OH NEGATIVE?

When combining atoms or groups to form a compound, look at their charges to determine how many of each you need in order for the positive and negative charges to cancel out (form a neural compound). Since Ba has a +2 charge and OH has a -1 charge, you need two OH groups to cancel out one Ba atom. In other words, make it so that +2 + -2 = 0. Here's the overall equation:Ba2+ + 2OH- --> Ba(OH)2