Question

What precipitate will form when aqueous solutions of sodium carbonate (na2co3) and calcium chloride (cacl2) are mixed?

Answer 1

The precipitate that would form when mixing aqueous solutions of sodium carbonate (na2co3) and calcium chloride (cacl2) would most likely be calcium carbonate (CaCO3). Mixing sodium carbonate and calcium chloride would result to a double replacement reaction or metathesis reaction forming two salts namely sodium chloride and calcium carbonate. Sodium chloride is very soluble in water while calcium chloride is only slightly soluble which means that it only dissolves into water up to a certain amount or degree. So, most probably it is the calcium carbonate that would precipitate out. The balanced chemical reaction would be:

Na2CO3 + CaCl2 = 2NaCl + CaCO3

Answer 2

CaCO₃ will precipitate when aqueous solutions of sodium carbonate  and calcium chloride are mixed

Further explanation

There are two types of chemical reactions that may occur.

namely single-replacement reactions and double-replacement reactions.

1. A single replacement reaction is a chemical reaction in which one element replaces the other elements of a compound to produce new elements and compounds

Not all of these reactions can occur. We can use the activity series, which is a list of elements that can replace other elements below / to the right of them in a single replacement reaction.

This series is better known as the Volta series, where the metal element with a more negative electrode potential is on the left, while the element with a more positive electrode potential on the right.

The more left the position of a metal in the series, the more reactive metal (easy to release electrons, the stronger the reductor)

Generally, the Volta series used is

Li K Ba Sr Ca Na Mg Al Mn Zn Cr Fe Cd Co Ni Sn Pb H Sb Bi Cu Hg Ag Pt Au

Example:

2Al (s) + 3Zn (NO₃) ₂ (aq) → 2Al (NO₃) ₃ (aq) + 3Zn (s)

The existing aluminum element can replace the zinc element, which is on the right side so the reaction will occur.

2. Double-Replacement reactions. Happens if there is an ion exchange between two ion compounds in the reactant to form two new ion compounds in the product

To predict whether this reaction can occur or not is one of them, the precipitation reaction. A precipitation reaction occurs if two ionic compounds which are dissolved reacted to produce one of the products of the ion compound does not dissolve. Formation of these precipitating compounds that cause reactions can occur

Solubility Rules:

• 1. soluble compound

All compounds of Li +, Na +, K +, Rb +, Cs +, and NH4 +

All compounds of NO₃⁻ and C₂H₃O₂⁻

Compounds of Cl−, Br−, I− except Ag⁺, Hg₂²⁺, Pb²⁺

Compounds of SO₄²⁻ except Hg₂²⁺, Pb²⁺, Sr²⁺, Ba²⁺

• 2. insoluble compounds

Compounds of CO₃²⁻ and PO₄³⁻ except for Compounds of Li +, Na +, K +, Rb +, Cs +, and NH₄ +

Compounds of OH− except Compounds of Li +, Na +, K +, Rb +, Cs +, NH₄⁺, Sr²⁺, and Ba²⁺

In reaction:

sodium carbonate (Na₂CO₃) and calcium chloride (CaCl₂)

Na₂CO₃ (aq) + CaCl₂ (aq) ⇒ 2NaCl (aq) + CaCO₃ (s)

The precipitated compound is CaCO₃ so that Double-Replacement reactions between Na₂CO₃ and CaCl₂ can occur

Learn more

A double-replacement equation

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the reducing agent

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substance loses electrons in a chemical reaction

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