Question
In: Chemistry
Part A Sodium fluoride (NaF ), sodium fluorosilicate (Na2SiF6 ), and fluorosilicic acid (H2SiF6 ) are...
Part A
Sodium fluoride (NaF ), sodium fluorosilicate (Na2SiF6 ), and fluorosilicic acid (H2SiF6 ) are commercially available in 100.0-lb containers. Calculate the mass, in kg , of fluoride ion (F− ) in a 100.0-lb container for each of these three compounds.
Express the masses in kilograms to two significant figures separated by commas.
Hints
Hint 1. Calculate the mass of fluoride in a 100-lb container of sodium fluoride(click to open)
Part B
Calculate the molarity of the dilute (25.0% weight/weight) fluorosilicic acid.
Express the molarity to three significant figures.
Hints
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Part C
A public water treatment plant located in a region with an annual average maximum temperature of 13.0 ∘C uses fluorosilicic acid to treat 60,000 gallons of water per day (6.00×104 gal ).
Calculate the amount of fluoride ions that must be added to the water, in kg , to meet the optimum amount of fluoride.
Express the mass in kilograms to three significant figures.
Hints
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| [H2SiF6] = | M | ||||||||||||
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| mF− = |
kg |
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Solutions
queen_honey_blossom answered 2 years agoRelated Solutions
A solution is made by a dissolving 16.8 g of sodium fluoride , NaF , in...
A
solution is made by a dissolving 16.8 g of sodium fluoride , NaF ,
in enough water to make exactly 500.ml of solution . Calculate the
molarity of each species: NaF, Na+ and F-.
What is the pH of a 0.186 M aqueous solution of sodium fluoride, NaF? (Ka for...
What is the pH of a 0.186 M aqueous solution of
sodium fluoride,
NaF? (Ka for
HF = 7.2×10-4)
Sodium fluoride and lead nitrate are both soluble in water. If 0.0946 g of NaF and...
Sodium fluoride and lead nitrate are both soluble in water. If
0.0946 g of NaF and 0.362 g of Pb(NO3)2are
dissolved in sufficient water to make 1.50 L of solution, will a
precipitate form? How do you know if there should be a precipitate
or not? What is the chemical formula for the possible precipitate?
The Ksp for lead fluoride is 3.7 x 10-8.
a) A buffer contains significant amounts of hydrofluoric (HF) and sodium fluoride (NaF). Write the net...
a) A buffer contains significant amounts of hydrofluoric (HF)
and sodium fluoride (NaF). Write the net ionic equation showing how
this buffer neutralizes added HNO3. Express your answer as a
chemical equation. Identify all of the phases in your answer
b) Write the net ionic equation showing how this buffer
neutralizes added KOH. Express your answer as a chemical equation.
Identify all of the phases in your answer
Molar Mass % F- % Pure Compound in the Commercial Product NaF Sodium Fluoride 42 45...
Molar Mass
% F-
% Pure Compound in the Commercial Product
NaF
Sodium Fluoride
42
45
95
Na2SiF6
Sodium fluorosilicate
188
61
95
H2SiF6
Fluorosilicic acid
144
79
30
ii. How much 30.0% commercial fluorosilicic acid in kg must be
added to 50,000 gallons of water in order to fluoridate at the
optimum level?
Sodium fluoride adopts the NaCl (FCC) structure type. Estimate the lattice energy, ΔU, for NaF using...
Sodium fluoride adopts the NaCl (FCC) structure type. Estimate
the lattice energy, ΔU, for NaF using the Born–Lande equation. The
bond length for Na–F is 235 pm, and the Madelung constant is
1.7476. The Born exponent of both the cation and the anion is
7.
3) a) Sodium fluoride has a Ksp of 0.934. If 15.00 g of sodium fluoride is...
3) a) Sodium fluoride has a Ksp of 0.934. If 15.00 g
of sodium fluoride is placed in a beaker containing 250. mL of
water, what are the concentrations of the ions in solution after
the solution is at equilibrium?
b) If solid in (a) was placed in 250. mL of a 0.200 M NaOH
solution instead of pure water, what mass of sodium fluoride would
dissolve
A 1 liter solution contains 0.382 M hydrofluoric acid and 0.509 M sodium fluoride. Addition of...
A 1 liter solution contains 0.382 M hydrofluoric acid and 0.509
M sodium fluoride. Addition of 0.191 moles of sodium hydroxide
will: (Assume that the volume does not change upon the addition of
sodium hydroxide.) Raise the pH slightly, Lower the pH slightly,
Raise the pH by several units, Lower the pH by several units, Not
change the pH ,Exceed the buffer capacity
Fluoride, in the form of sodium silicofluoride (Na2SiF6), is commonly added to municipal drinking water to...
Fluoride, in the form of sodium silicofluoride (Na2SiF6), is
commonly added to municipal drinking water to prevent tooth decay.
It is generally added at a level of 1.0 mg/L, but its maximum
concentration level (MCL) cannot exceed 4.0 mg/L. You have been
assigned to prepare a liter of a standard solution that contains
1.000 mg/L fluoride. a. Which balance in your lab would you use to
prepare the solution? Explain why.
A) How many grams of solid sodium fluoride should be added to 2.00 L of a...
A) How many grams of solid sodium
fluoride should be added to 2.00
L of a 0.190 M hydrofluoric acid
solution to prepare a buffer with a pH of 2.425
?
grams sodium fluoride = g.
B) How many grams of solid sodium
fluoride should be added to 1.00
L of a 0.299 M hydrofluoric acid
solution to prepare a buffer with a pH of 3.825
?
grams sodium fluoride = g.
C) How many grams of solid ammonium
bromide...
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