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WorksheetsConcept of concentration and titration
Total questions: 15
Worksheet time: 15mins
The molarity of a solution prepared by dissolving 45.0 g of glucose (C6H12O6,) in 71.0 mL of water is____ [MW of glucose = 180 g/mol]
0.0352 M
3.52 M
0.352 M
35.2 M
How many grams of chloride ions are there in 100 mL of 1.90 M aqueous solution of sodium chloride?
[At.wt: Na = 23 Cl = 35.5]
13.5 g
6.74 g
0.67 g
1.35 g
If you want to prepare a 200 mL aqueous solution of MgO which is 20% by mass magnesium oxide, how many grams of magnesium oxide would be needed?(assume that the density of the solution is the same as the density of water)
40 grams
50 grams
30 grams
20 grams
How many grams of Calcium fluoride are needed to prepare 980 mL a 2.0 molar aqueous solution?
150 grams
2.0 grams
1.5 x 105 grams
160 grams
Molarity is measured in _____.
moles per g.
mols per L.
moles per mm.
moles per mL.
How do you convert from grams to moles?
Divide by the molar mass
Multiply by the molar mass
Divide by Avogadro's number
Multiply by Avogadro's number
Calculate the number of moles in 10cm3 of 0.25 mol dm-3 KOH
2.5
0.25
0.025
0.0025
2.46 g of sodium hydroxide (molar mass = 40) is dissolved in water and the solution is made to 100 cm3 in a volumetric flask. The molarity of the solution is:
3.14 M
0.04 M
0.615 M
4.2 M
How many grams of Na2CO3 should be dissolved to make 100 cm3 of 0.15 M Na2CO3 solution?
3.6 g
1.59 g
2.80g
4.32 g
250 mL of 1.5 M solution of sulphuric acid is diluted by adding 5L of water. The molarity of the diluted solution is:
0.0926
0.0823
0.0714
12
What is the endpoint of a titration
Where the amount of acid and base are equal as shown by a color change of an indicator
Where there is no base
When the volume of base in the burette is used up
When there is no acid in the flask
The following neutralization reaction occurs in the classroom.
HCl + KOH --> H2O + KCl
If a student uses 25.0 mL of a 0.5M solution of KOH, what is the molarity of the acid if the is 15.0mL of acid neutralized?
0.8M
1.2M
12.5M
0.08M
What is this piece of apparatus called
graduated pipette
Burette
pasteur pipette
Cuvette
