Question

assignment 4:
write the formulas for these ionic compounds:

1. copper (i) hydroxide
2. sodium sulfate
3. magnesium acetate
4. ammonium phosphate
5. aluminum carbonate
6. potassium cyanide

name these ionic compounds:

1. ag₃(po₄)
2. k₂(co₃)
3. mg(oh)₂
4. al₂(so₄)₃
5. na(cn)
6. ba(ch₃coo)₂

Explanation:

Step1: Balance charges for Cu(I)OH⁻

Copper(I) is $\text{Cu}^+$ (charge +1), hydroxide is $\text{OH}^-$ (charge -1). 1:1 ratio balances charge.
$\text{CuOH}$

Step2: Balance charges for Na⁺SO₄²⁻

Sodium is $\text{Na}^+$ (charge +1), sulfate is $\text{SO}_4^{2-}$ (charge -2). 2 Na⁺ balance 1 SO₄²⁻.
$\text{Na}_2\text{SO}_4$

Step3: Balance charges for Mg²⁺CH₃COO⁻

Magnesium is $\text{Mg}^{2+}$ (charge +2), acetate is $\text{CH}_3\text{COO}^-$ (charge -1). 1 Mg²⁺ balances 2 CH₃COO⁻.
$\text{Mg(CH}_3\text{COO)}_2$

Step4: Balance charges for NH₄⁺PO₄³⁻

Ammonium is $\text{NH}_4^+$ (charge +1), phosphate is $\text{PO}_4^{3-}$ (charge -3). 3 NH₄⁺ balance 1 PO₄³⁻.
$\text{(NH}_4\text{)}_3\text{PO}_4$

Step5: Balance charges for Al³⁺CO₃²⁻

Aluminum is $\text{Al}^{3+}$ (charge +3), carbonate is $\text{CO}_3^{2-}$ (charge -2). 2 Al³⁺ and 3 CO₃²⁻ balance charge.
$\text{Al}_2\text{(CO}_3\text{)}_3$

Step6: Balance charges for K⁺CN⁻

Potassium is $\text{K}^+$ (charge +1), cyanide is $\text{CN}^-$ (charge -1). 1:1 ratio balances charge.
$\text{KCN}$

Step7: Name Ag₃(PO₄)

$\text{Ag}^+$ is silver(I), $\text{PO}_4^{3-}$ is phosphate.
Silver(I) Phosphate

Step8: Name K₂(CO₃)

$\text{K}^+$ is potassium, $\text{CO}_3^{2-}$ is carbonate.
Potassium Carbonate

Step9: Name Mg(OH)₂

$\text{Mg}^{2+}$ is magnesium, $\text{OH}^-$ is hydroxide.
Magnesium Hydroxide

Step10: Name Al₂(SO₄)₃

$\text{Al}^{3+}$ is aluminum, $\text{SO}_4^{2-}$ is sulfate.
Aluminum Sulfate

Step11: Name Na(CN)

$\text{Na}^+$ is sodium, $\text{CN}^-$ is cyanide.
Sodium Cyanide

Step12: Name Ba(CH₃COO)₂

$\text{Ba}^{2+}$ is barium, $\text{CH}_3\text{COO}^-$ is acetate.
Barium Acetate

Answer:

1. $\text{CuOH}$
2. $\text{Na}_2\text{SO}_4$
3. $\text{Mg(CH}_3\text{COO)}_2$
4. $\text{(NH}_4\text{)}_3\text{PO}_4$
5. $\text{Al}_2\text{(CO}_3\text{)}_3$
6. $\text{KCN}$
7. Silver(I) Phosphate
8. Potassium Carbonate
9. Magnesium Hydroxide
10. Aluminum Sulfate
11. Sodium Cyanide
12. Barium Acetate