During Dissolved oxygen estimation, a 14 gm of KOH (M.W. 56), & 16 gm of KI (M.W 166) transfered into 500ml of volumetric flask & finally converted into 500ml solution after collecting washings from the beaker. Calculate % W/V of Solution, Normality, Molarity of prepared solution.
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Answer:
Molar mass of solute (KOH) = (39 + 16 + 1) gm = 56 gm
∴
Number of moles =
Given weight
Molecular mass
=
5.6
56
=
0.1
Also, molarity =
Number of moles
Volume of solution (litre)
=
0.1
500
×
10
−
3
Molarity = 0.2 M