A government laboratory wants to determine whether water in a certain city has any traces of fluoride and whether the concentrat
2 answers:
Answer: The water is unsafe to drink because 30.4 ppm > 4 ppm.
Explanation: The recommended concentration of fluoride in the water is 4.00 ppm. If the concentration of fluoride increases the recommended limit, the water is unsafe to drink and vice-versa.
Parts Per Million (ppm) is the measurement of the concentration of the solution. It is expressed in mg/kg, which means:
We are given a sample of 5.00 grams and the solute is fluoride which has a weight of 0.152 mg.
Weight of the sample = 5.00 grams = 0.005 kg (Conversion factor: 1 kg = 1000g)
Putting values in ppm equation, we get:
As the ppm value is more than the recommended value. Hence, the water is unsafe to drink.
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Answer: The concentration of excess in solution is 0.017 M.
Explanation:
1.
moles of
1 mole of give = 1 mole of
Thus 0.019 moles of give = 0.019 mole of
2. moles of
According to stoichiometry:
1 mole of gives = 2 moles of
Thus 0.012 moles of give =
moles of
As 1 mole of neutralize 1 mole of
0.019 mole of will neutralize 0.019 mole of
Thus (0.024-0.019)= 0.005 moles of will be left.
Thus molarity of in solution is 0.017 M.
Answer:
The K sp Value is
Explanation:
From the question we are told that
The of is = 122.5 g/ mol
The mass of dissolved is
The volume of solution is
The number of moles of is mathematically evaluated as
Substituting values
Generally concentration is mathematically represented as
For
The dissociation reaction of is
The solubility product constant is mathematically represented as
Since there is no ionic reactant we have