Write a net ionic equation for the reaction that occurs when aqueous solutions o

Question

Write a net ionic equation for the reaction that occurs when aqueous solutions of sodium hydroxide and hydrocyanic acid are combined.

Write a net ionic equation for the reaction that occurs when aqueous solutions of perchloric acid and ammonia are combined.

You need to make an aqueous solution of 0.165 M calcium iodide for an experiment in lab, using a 250 mL volumetric flask. How much solid calcium iodide should you add?

? grams

Explanation / Answer

1.

Molecular equation:
NaOH (aq.) + HCN (aq.) -----------> NaCN (aq.) + H2O (l)

Complete ionic equation:

Na+ (aq.) + OH- (aq.) + H+ (aq.) + CN- (aq.) -------> Na+ (aq.) + CN- (aq.) H2O (l)

Net ionic equation:

OH- (aq.) + H+ (aq.) ----------> H2O (l)

2.

Molecular equation:

HClO4 (aq.) + NH3 (aq.) ----------> NH4ClO4 (aq.)

Complete ionic equation:

H+ (aq.) + ClO4- (aq.) + NH3 (aq.) -----------> NH4+ (aq.) + ClO4- (aq.)

Net ionic equation:

H+ (aq.) NH3 (aq.) ---------> NH4+ (aq.)

3.

Molarity = moles of solute / volume of solution in L

Moles of solute = 0.165 * 250 / 1000 = 0.04125 mol

But,

number of moles = mass / molar mass

Mass of CaI2 = 0.04125 * 294 = 12.1 g.

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.