Question

Please solve question number 4

Answer 1

( a) MOLARITY = MOLES OF SOLUTE / VOLUME OF SOLUTION

Moles of NaCl = Mass / Molar mass

Moles of NaCl = 5. 85 / 58.5 = 0.1

Molarity = 0.1 / 200 ml = 0.0005 M

(b) Moles of NaBr = 20.6/103 = 0.2

MOLARITY = 0.2 / 500 = 0.0004 M