Question Video: Determining Which Sulfate Salt Is Insoluble | Nagwa Question Video: Determining Which Sulfate Salt Is Insoluble | Nagwa

Question Video: Determining Which Sulfate Salt Is Insoluble Chemistry • First Year of Secondary School

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The following equations show four chemical reactions that form sulfate salts: BaCl₂ (aq) + MgSO₄ (aq) ⟶ MgCl₂ (aq) + BaSO₄ (s), Mg (s) + H₂SO₄ (aq) ⟶ MgSO₄ (aq) + H₂ (g), 2NaOH (aq) + H₂SO₄ (aq) ⟶ Na₂SO₄ (aq) + 2H₂O (l), 2NH₃ (aq) + H₂SO₄ (aq) ⟶ (NH₄)₂(SO₄) (aq), Which of the sulfate salts is insoluble?

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Video Transcript

The following equation shows four chemical reactions that form sulfate salts. BaCl2 aqueous plus MgSO4 aqueous yields MgCl2 aqueous plus BaSO4 solid. Mg solid plus H2SO4 aqueous yields MgSO4 aqueous plus H2 gas. Two NaOH aqueous plus H2SO4 aqueous yields Na2SO4 aqueous plus two H2O liquid. Two NH3 aqueous plus H2SO4 aqueous yields (NH4)2(SO4) aqueous. Which of the sulfate salts is insoluble?

This question is asking us to identify a chemical reaction that forms an insoluble sulfate salt. Before we begin this problem, let us first review the parts of a chemical equation. We need to discuss that chemicals that start within a chemical reaction called reactants are located on the left-hand side of the arrow in a chemical equation. Chemicals that are formed during a chemical reaction are called products and are found to the right of the arrow within a chemical equation. Since we need to find an insoluble sulfate salt that was formed, we need to only look at the sulfates on the right-hand side of the chemical equation, which would be the product side.

Now that we know which side of the chemical equation we will be focusing on, now let us identify a sulfate salt. The sulfate salt is SO4 2−. And a sulfate salt is a salt that has a cation with SO4 as the anion. Therefore, we are only looking at BaSO4, MgSO4, Na2SO4, and (NH4)2(SO4) as potential sulfate salts that are insoluble.

Since we have identified the sulfate salts in each reaction, now we can review how to identify an insoluble compound in a chemical equation. The term insoluble refers to a chemical that cannot dissolve in a substance. When looking at the states of matter in a chemical equation, we need to discuss that “g” means the chemical or element is in a gaseous state. “l” is a liquid, such as water, bromine, or mercury. “aq” means the substance has been dissolved in water and is an aqueous solution and is therefore soluble. And “s” means the chemical is a solid or insoluble. The only sulfate salt that has an s for solid is BaSO4.

Therefore, BaSO4 is the only insoluble salt formed within the four chemical equations.

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