Question

22 & 23 please

QUESTION 22 Which of the following statement(s) about electrolytes are true? 1. Electrolyte solutions conduct electricity because electrons are freely moving through the solution. 2. Electrolyte solutions conduct electricity because ions are moving through the solution 3. When methanol (CH3OH) is dissolved in water, an electrolytic solution results 4. When sulfuric acid acid is dissolved in water, a conducting solution results 5. If an aqueous solution containing sodium chloride is diluted, the conductivity will go down 2.4.5 0 1 2 4,5 O 1, 2, 3, 4 0 1,4,5 All of the above are tue QUESTION 23 What mass of precipitate do you expect when mixing 200.0 mL of a 3.84 M magnesium chloride solution with 250.0 mL of a 4.BBM silver nitrate solution? ADVI-

Answer 1

Ans 22 :

Option A is correct.

Electrolytes are solution which dissociates into ions when dissolved in water. These ions move freely in solution and conduct electricity. H2SO4 is also a conducting electrolyte .

The conductivity is the conductivity of per unit volume of solution .On dilution number of ions per unit volume decreases. Henc conductivity will go down.

Ans 2: moles of magnesium chloride = 3.84 x 0.2 L = 0.768 mol

moles of silver nitrate =( 4.88 x 250 )/1000 = 1.22 mol

Reaction is MgCl2  + 2AgNO3 ------> 2AgCl (s) + Mg(NO3)2

1mole of MgCl2 react with 2mol of AgNO3

0.768 moles of MgCl2 react with mole of AgNO3 = 1.536 mol but we have only 1.22 moles of silver nitrate .so it is limiting reagent.

1 mole of silver nitrate . Give 1 mole of AgCl.

1.22 mole of silvernitrate give AgCl = 1.22 mole

Mass of AgCl precipitate formed =1.22 x 143

= 174.46 g