How To Name the Formulas of These Compounds? (Please Help)

What are the formulas for these compounds..

1. Oxalic Acid
2. Perchloric Acid
3. Chromic Acid
4. Chloric Acid
5. Hydroiodic Acid
6. Phosphorous acid
7. Nitrous Acid
8. Bromic Acid




How do you determine the formulas for those kinds of compounds (acids) ^^


BQ: What would the name of this compounds be?

1. Na3Po4 (dot) 12 H2O
2. MgSO4 (dot) 7H2O

1. Oxalic Acid
H2C2O4

2. Perchloric Acid
HClO4

3. Chromic Acid
H2CrO4

4. Chloric Acid
HClO3

5. Hydroiodic Acid
HI

6. Phosphorous acid
H3PO3

7. Nitrous Acid
HNO2

8. Bromic Acid
HBrO3

How do you determine the formulas for those kinds of compounds (acids) ^^
when you see "Hydro"....."ic" the acid is H+ combined with Fluoride F-1, chloride Cl-1, bromide Br-1, iodide I-1, or sulfide S-2

when you do not see the "hydro" but do end in "ic", the acid is made with phosphate (PO4)-3, sulfate (SO4)-2, chlorate (ClO3)-1, carbonate (CO3)-2, nitrate (NO3)-1

when you do not see the "hydro" but do end in "ous", the acid is made with phosphite (PO3)-3, sulfite (SO4)-2, chlorite (ClO2)-1, carbonite (CO2)-2, nitrite (NO2)-1 (ites have 1 less oxygen that the ates)

=====================


BQ: What would the name of this compounds be?

1. Na3Po4 (dot) 12 H2O ...........Sodium phosphate dodecahydrate
2. MgSO4 (dot) 7H2O..........Magnesium sulfate heptahydrate