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

SubmitMy AnswersGive Up

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

[H2SiF6] =

mF− =

Solutions

Expert Solution

queen_honey_blossom answered 1 year ago

Next > < Previous

Related 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...

Subjects