3. Chemical Reactions

Give the systematic name from the given formula:K₂Cr₂O₇ ∙ 3 H₂O

Write the chemical formula for the following compound:Calcium selenide hexahydrate

Write the name from the formula or the formula from the name for each hydrated ionic compound.

a. CoSO₄•7 H₂O

b. iridium(III) bromide tetrahydrate

c. Mg(BrO₃)₂•6 H₂O

d. potassium carbonate dihydrate

Write the name from the formula or the formula from the name for each hydrated ionic compound.

a. cobalt(II) phosphate octahydrate

b. BeCl₂•2 H₂O

c. chromium(III) phosphate trihydrate

d. LiNO₂•H₂O

Washing soda, a compound used to prepare hard water for washing laundry, is a hydrate, which means that a certain number of water molecules are included in the solid structure. Its formula can be written as Na2CO3 # xH2O, where x is the number of moles of H2O per mole of Na2CO3. When a 2.558-g sample of washing soda is heated at 125 C, all the water of hydration is lost, leaving 0.948 g of Na2CO3. What is the value of x?

Epsom salts, a strong laxative used in veterinary medicine, is a hydrate, which means that a certain number of water molecules are included in the solid structure. The formula for Epsom salts can be written as MgSO4 # xH2O, where x indicates the number of moles of H2O per mole of MgSO4. When 5.061 g of this hydrate is heated to 250 C, all the water of hydration is lost, leaving 2.472 g of MgSO4. What is the value of x?