Answer:
pH= 3.82
Explanation:
Sodium ethanoate or sodium acetate (CH3COONa) ionises completely.
Ethanoic acid or acetic acid (CH3COOH), ionises partially because it is a weak acid.
What is the mass of lead in 452 g PbCl2?
1 answer:
335.664 grams is the mass of lead in 452 grams of PbCl2.
Explanation:
Data given:
mass of lead in PbCl2 = 452 grams
mass of lead =?
atomic mass of PbCl2 = 278.1 grams/mole
atomic mass of Pb = 207.2 grams/mole
atomic mass of chlorine = 35.45 grams/mole
From the chemical formula of PbCl2 it is deduced that 1 mole of lead chloride contains 1 mole of Pb cation and 2 moles of chloride anion
number of moles of PbCl2 provided are:
number of moles =
number of moles = 1.62 moles of PbCl2 is provided
so when 1 mole of PbCl2 contains 1 mole of lead
then 1.62 moles of PbCl2 will have 1.62 moles of lead
mass = atomic mass x number of moles
mass of lead = 1.62 x 207.2
mass of lead = 335.664 grams
335.664 grams of lead is present in a sample of lead chloride having mass of 452 grams.
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Answer : The molar mass of the solute would be low.
Explanation :
Formula used for depression in freezing point is:
where,
= change in freezing point
= freezing point of solution
= freezing point of water
i = Van't Hoff factor
= freezing point constant
m = molality
= mass of solute
= mass of solvent
= molar mass of solute
From the formula we conclude that, when the freezing point of the solution read incorrectly that is freezing point of the solution is lower than the true freezing point then this means that change in freezing point would be high and the molar mass of the solute would be low.
Hence, the molar mass of the solute would be low.