Write chemical formulas for the compounds formed by the following positive and negative ions: Ba2+ and NO3-, Al3+ and Co3, and K+ and PO43-
It's tough to do this on the internet but follow these instructions. K^+ and PO4^3- will be K3PO4
Write the ions together like this.
KPO4. I like to put parentheses around those that are polyatomic ions like PO4^3-. So
K(PO4)
above the K write its charge of 1 and above the PO4 write its charge 3 (ignore the signs). It's hard to show this because of spacing but I will use dots to space.
1...3
K(PO4)
Now draw a large X. The left downward diagonal starts at the 1 and and ends at the BOTTOM RIGHT of the (PO4). The right diagonal starts at the 3 and ends at the BOTTOM LEFT at the right of the K. Now the numbers at the top follow the diagonals to the bottom and you end up with K3(PO4)1. You don't need to write the ones since they are understood and if the polyatomic ion is just 1 then you can omit the parentheses so you write K3PO4 for potassium phosphate.
Note that with Ba(NO3)2 you can't remove the parentheses.
To find the chemical formulas for compounds formed by positive and negative ions, we need to balance the charges of the ions.
1. Ba2+ and NO3-:
The charges must balance out, so Ba2+ requires two NO3- ions. Thus, the chemical formula is Ba(NO3)2.
2. Al3+ and CO3:
The 3+ charge on aluminum requires three CO3 ions to balance. However, the CO3 ion is carbonate, and it carries a 2- charge. Since the charges do not balance, these ions will not form a stable compound.
3. K+ and PO43-:
To balance the charges, one K+ ion combines with one PO43- ion. The chemical formula for the compound is K3PO4.
Remember, when writing chemical formulas, we need to ensure that the charges on the ions balance to create electrically neutral compounds.
The chemical formulas for the compounds formed by the given positive and negative ions are as follows:
1. Ba2+ and NO3-: Barium nitrate
The formula of barium nitrate is Ba(NO3)2.
2. Al3+ and CO3^2-: Aluminum carbonate
The formula of aluminum carbonate is Al2(CO3)3.
3. K+ and PO4^3-: Potassium phosphate
The formula of potassium phosphate is K3PO4.