Answer to Question #127553 in General Chemistry for mike

Question

Assuming the compounds are fully dissolved, identify the ions that exist in the following aqueous solutions and state the concentration of each ion present.
(i). potassium chloride, KCl, (0.10mol L-1)
(ii). sodium carbonate, Na2CO3, (0.125mol L-1)
(iii). ammonium sulfate, (NH4)2SO4, (0.25mol L-1)

Answer 1

(I) Potassium chloride KCl

KCl $\to$ K⁺ + Cl^-

According to equation one mole of KCl produce one mole of potassium cation and one mole of Chloride anion

according to given data 0.10 mol/L KCl in aqueous medium it produce .10mol/L K⁺ and .10 mol/L Cl^-

(ii) sodium carbonate

Na₂CO₃ $\to$ 2Na⁺ + CO₃^2-

According to equation one mole of sodium carbonate produce 2 mole of sodium ion and 1 mole of carbonate ion

Accoding to given data .125 mol/L sodium carbonate in aqueous medium it produce 2×.125=.250 mol/L Na⁺ and .125 mol/L CO₃^2-

(iii) Ammonium sulfate

(NH₄)₂SO₄ $\to$ 2NH₄⁺ + SO₄^2-

According to equation 1 mole of ammonium sulfate produce 2 mole of ammonium ion and 1 mole of sulfate ion

According to given data .25 mol/L ammonium sulfate present in aqueous medium it produce 2×.25=.50 mol/L NH₄⁺ ion and .50 mol/L SO₄^2- ion.