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C2 ions testing

C2 precipitates and ions testing

QuestionAnswer
What is the chemical test for Ca+2 ion? when the compound is placed in a flame, the flame turns red
What is the chemical test for Cu+2? when the compound is placed in a flame, the flame turns green
What is the chemical test for Cl-? Add Nitric acid then silver nitrate AND acid solution; a white precipitate forms
What is the colour of the flame when you burn Na+ ions? Yellow
What is the colour of the flame when you burn K+ ions? Lilac
What is the chemical test for CO3-2? Fizz on addition of HCl; the gas produced will turn limewater cloudy
What is the chemical test for SO4-2? add Hydrochloric acid then barium chloride solution; a white precipitates forms
What kind of ions does a flame test help identify? Metallic ions
Lead iodide is an insoluble salt. Describe the steps needed to prepare a pure, dry sample of lead iodide from solutions of lead nitrate and potassium iodide. mixing solutions in a beaker filtering off the precipitate, including apparatus washing the precipitate drying the precipitate (oven/between filter papers)
Describe the tests you could carry out on a sample of water to show that it contained dissolved Potassium Carbonate sodium (ions) cause a yellow flame(1) for chloride ions: add dilute nitric acid (1) add silver nitrate (solution) (1) white precipitate/solid forms (1)
Lead Iodide is insoluble. What solution could you add to Lead Nitrate to make Lead Iodide? Sodium Iodide. Or Potassium Iodide.
What is the name of the precipitate formed when Barium Nitrate is added to Sodium Sulfate? Barium Sulfate
What is Barium Sulfate used for? To help with X-rays of the intestines
Why do we ask patients to eat Barium Sulfate when they need an X-Ray of the intestines and yet Barium ions are toxic? Because Barium Sulfate is insoluble so there are no Barium ions able to go into the blood.
What is a precipitate? A precipitate is formed when two solutions are mixed and an insoluble compound forms; the precipitate is the insoluble compound
Are Nitrate salts soluble or insoluble? Soluble
Are Sodium Salts soluble or insoluble? soluble
When barium chloride solution, BaCl2, is added to sodium sulfate solution, Na2SO4, a white precipitate of barium sulfate, BaSO4, is formed. Write the balanced equation for this reaction. Word equation first: barium chloride + sodium sulfate --> barium sulfate + sodium chloride Formulae: BaCl2 + Na2SO4 --> BaSO4 + NaCl Balancing: BaCl2 + Na2SO4 --> BaSO4 + 2 NaCl
What is the trick to remember the salts that are always soluble? SNAP; Sodium Nitrate Ammonium Potassium salts are always soluble
What are the 3 insoluble salts that you MUST remember? Calcium Carbonate; Barium Sulfate and Silver Chloride
When calcium chloride solution, CaCl2, is added to sodium carbonate solution, Na2CO3, a white precipitate of barium sulfate, CaCO3, is formed. Write the balanced equation for this reaction. Word equation first: calcium chloride + sodium carbonate--> calcium carbonate + sodium chloride Formulae: CaCl2 + Na2CO3 --> CaCO3 + NaCl Balancing: CaCl2 + Na2CO3 --> CaCO3 + 2 NaCl
What is the formula of Magnesium Chloride? get the CHARGES from the Periodic table: Mg+2 and Cl-1; then SWAP THE NUMBERS and write at the bottom: Mg1Cl2
What is the formula of Magnesium Nitrate? get the CHARGES from the Periodic table or LEARN special groups: Mg+2 and (NO3)-1; then SWAP THE NUMBERS and write at the bottom: Mg1(NO3)2
What is the formula of Sodium Sulfate? get the CHARGES from the Periodic table or LEARN special groups: Na+1 and (SO4)-2; then SWAP THE NUMBERS and write at the bottom: Na2(SO4)1
What two solutions could you use to make a precipitate of Silver Chloride? Silver nitrate and Sodium chloride; both chemicals are soluble because of SNAP
What is the formula of Barium Sulfate? get the CHARGES from the Periodic table or LEARN special groups: Ba+2 and (SO4)-2; then SWAP THE NUMBERS and write at the bottom: Ba2(SO4)2; check if you need to CANCEL when both subscripts are 2: Ba(SO4)
Created by: UrsulineChem