Question

For questions 5-7, use the observations from the experiment to determine the names and formulas of various common compounds. 5. A common table salt substitute gives a lavender flame test. It also violds a nitric acid insoluble white precipitate upon the addition of silver nitrate. What are the formula and name of this compound sold salt substitute? Two of the ions in this lab depend on their conversion into a gas for detection. The two ions will forman ionic compound. What are the formula and name of the compound? Some dust from a shoe print at a crime scene is dissolved in nitric acid and analyzed. The flame test yields a brick orange flicker followed by a more vellow long-lasting flame, and the dust sample yields a white precipitate when heated with ammonium oxalate. The barium chloride test yields a nitric acid insoluble precipitate. From this data, the investigator concludes that traces of gypsum, a major component of many dry wall products. From the above lab data, what are the formula and name of the compound in gypsum? For questions 8-9, write a procedure to determine the compound present. HINT: we used aqueous solutions in lab, so if you are starting with a solid, you should dissolve it in water! 8. Two common substances that are used in the northern U.S. to melt snow and ice are sodium chloride (rock salt) and calcium chloride. You have a bag of a substance sold as melting salt. Outline a short procedure that will identify which type of salt is present. 9. A balance is checked before a laboratory session and found to be accurate and clean. After the laboratory, a spilled white solid is found on the balance. The only white substances available in the laboratory were barium chloride and sodium sulfate. Outline a procedure to determine which of the solic has been spilled. Why is it important to know which of the two solids is on the balance before the spillis cleaned up?

Answer 1

Solution:

5) Salt is KCl (potasium chloride).

KCl + HNO3 = KNO3 (white precipitate) + HCl

KCl+ AgNO3 = AgCl (white curdy precipitate) + KNO3

KCl give lavender flame test.