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Chapter 4: Q4.24P (page 179)

Which ions do not appear in a net ionic equation? Why?

Short Answer

Expert verified

Spectator ions do not appear in a net ionic equation.

The net ionic reaction represents the ions taking part in a chemical reaction. But the spectator ions do not undergo any chemical reaction and that is why they are not present in a net ionic equation.

Step by step solution

01

Define spectator ions 

Those ions which do not participate in the chemical reaction are known as spectator ions.

Example:

Ag+(aq)+NO3-(aq)+Na+(aq)+Cl-(aq)鈫�[Na+(aq)+NO3-(aq)]+AgCl(s)\hfillspectatorionsproduct

In the example given above, and are present in both the sides and so they can be cancelled out. Therefore we can say that spectator ions do not participate in the chemical reactions.

02

Determine the presence of spectator ions present in net ionic equation

In the net ionic equation, we show only those ions or reactants which are involved in the chemical reaction.The ions which do not participate in the chemical reaction are known as spectator ions and hencethey do not appear in a net ionic equation.

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Most popular questions from this chapter

The net ionic equation for the aqueous neutralization reaction between acetic acid and sodium hydroxide is different from that for the reaction between hydrochloric acid and sodium hydroxide. Explain by writing balanced net ionic equations.

There are various methods for finding the composition of an alloy (a metal-like mixture). Show that calculating the mass % of Mg in a magnesium-aluminum alloy (d = 2.40 g/cm3) gives the same answer (within rounding) using each of these methods:

(a) a0.263-gsampleofalloy(dofMg=1.74g/cm3;dofAl=2.70g/cm3);

(b) an identical sample reacting with excess aqueous HCl forms 1.38x10-2molofH2;

(c) an identical sample reacting with excess O2 forms 0.483 g of oxide.

For the following aqueous reactions, complete and balance the molecular equation and write a net ionic equation:

(a) Manganese(II) sulfide + hydrobromic acid

(b) Potassium carbonate + strontium nitrate

(c) Potassium nitrite + hydrochloric acid

(d) Calcium hydroxide + nitric acid

(e) Barium acetate + iron(II) sulfate

(f) Zinc carbonate + sulfuric acid

(g) Copper(II) nitrate + hydrosulfuric acid

(h) Magnesium hydroxide + chloric acid

(i) Potassium chloride + ammonium phosphate

(j) Barium hydroxide + hydrocyanic acid

In a combination reaction, 1.62 g of lithium is mixed with 6.50 g of oxygen.

(a) Which reactant is present in excess?

(b) How many moles of product are formed?

(c) After reaction, how many grams of each reactant and product are present?

To find the mass percent of dolomite CaMg(CO3)2 in a soil sample, a geochemist titrates 13.86g of soil with 33.56mL of 0.2516M HCl. What is the mass percent of dolomite in the soil?
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