16 Hydrofluoric acid reacts with silicon dioxide to produce hexafluorosilicic acid (H,SiF). This acid can be added to drinking water to promote good dental health. When added to water all the fluorine in the acid is available as fluoride ions The water in a certain city contains 7.60 x 10 mol dm of fluoride ions. What mass of hexafluorosilicic acid should be added to each dm of water to increase the fluoride level to 4.00 x 10 mol dm? (Relative atomic masses: H = 1.0, F = 19.0, Si = 28.1) %3D %3D
16 Hydrofluoric acid reacts with silicon dioxide to produce hexafluorosilicic acid (H,SiF). This acid can be added to drinking water to promote good dental health. When added to water all the fluorine in the acid is available as fluoride ions The water in a certain city contains 7.60 x 10 mol dm of fluoride ions. What mass of hexafluorosilicic acid should be added to each dm of water to increase the fluoride level to 4.00 x 10 mol dm? (Relative atomic masses: H = 1.0, F = 19.0, Si = 28.1) %3D %3D
Chemistry
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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Question 16
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TOPIC 4 Acids and Bases
PART III STRUCTURED QUESTIONS
14 Calculate the molarity of each solution below.
a) 37.8 g of nitric acid (HNO,) in 400.0 cm³ solution
(Relative atomic masses: H = 1.0, N = 14.0, O = 16.0)
b) 87.9 g of lithium sulphate (Li,SO.) in 2.00 dm² solution
(Relative atomic masses: Li = 6.9, O = 16.0, S = 32.1)
15 What is the mass of solute in each solution below?
a) 250.0 cm' of 0.600 mol dm sodium carbonate (Na,CO,) solution
(Relative atomic masses: C = 12.0, O = 16.0, Na = 23.0)
b) 5.00 dm' of 0.106 mol dm iron(Il) chloride (FeCl,) solution
(Relative atomic masses: Cl = 35.5, Fe = 55.8)
16 Hydrofluoric acid reacts with silicon dioxide to produce hexafluorosilicic acid (H,SiF). This acid can be added to drinking
water to promote good dental health. When added to water all the fluorine in the acid is available as fluoride ions.
The water in a certain city contains 7.60 x 10° mol dm of fluoride ions. What mass of hexafluorosilicic acid should
be added to each dm' of water to increase the fluoride level to 4.00 x 10 mol dm3?
(Relative atomic masses: H = 1.0, F = 19.0, Si = 28.1)
17. 100 0 cm? of 0.240 mol dm³ sodium chloride solution are mixed with 150.0 cm² of 0.200 mol dm3 magnesium
chloride solution.
What is the concentration of chloride ions in the resulting solution?
10. A 0 0178 mol dm nitric acid (HNO3(aq)) is prepared. The acid dissociates into hydrogen ions and nitrate jons
completely in water.
What is its pH value?
19 What is the concentration of hydrogen ions in each of the following substances?
a) Beer with a pH of 4.20
b) Sea water with a pH of 7.90
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