EBK A SMALL SCALE APPROACH TO ORGANIC L
4th Edition
ISBN: 9781305446021
Author: Lampman
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Ammonium sulfate is added to an unknown mixture of ions. No precipitate forms.
Ammonium oxalate is then added and a precipitate forms. The solution is
centrifuged, and the remaining solution is decanted. Sodium monohydrogen
phosphate and sodium hydroxide are added to the decanted solution, and no
precipitate forms. Sodium hydroxide is added to a fresh sample of the unknown. A
damp piece of litmus paper over the opening of the test tube turns blue.
Select the ions present.
Ba2+
Ca2+
O Mg2+
NH41+
Classify each reaction according to whether a precipitate forms.
A solution contains 0.10 M potassium sulfate and 0.10 M sodiùm sulfide.
Solid silver nitrate is added slowly to this mixture.
What is the formula of the substance that precipitates first?
formula
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- According to the Resource Conservation and Recovery Act (RCRA), waste material is classified as toxic and must be handled as hazardous if the lead concentration exceeds 5 mg/L. By adding chloride ion, the lead ion will precipitate as PbCl2, which can be separated from the liquid portion. Once the lead has been removed, the rest of the waste can be sent to a conventional waste treatment facility. How many grams of sodium chloride must be added to 500 L of a waste solution to reduce the concentration of the Pb2+ ion from 10 to 5 mg/L?arrow_forwardA 0.250-M sodium sulfate solution is added to a 0.200-M barium nitrate solution and 0.700 g barium sulfate precipitates. Write the balanced equation for this reaction. Calculate the minimum volume of barium nitrate solution that was used. Calculate the minimum volume of sodium sulfate needed to precipitate 0.700 g barium sulfate. Assume 100% yield.arrow_forwardA precipitate that could be formed from soft acids is silver chloride. True or false?arrow_forward
- What mass of CO2 is formed if 100 g of CaCL2 is also formed in the reaction below CaCO3 + 2 HCL——> CaCL2+ H2O + CO2arrow_forwardLPG with bromine Get one tube containing LPG and quickly add a few drops of bromine Replace the cork immediately to prevent the escape of the gas Shake the tube and observe for the appearance of a precipitate Test for the presence of HBr with a blue litmus paper moistened with distilled water and held with tweezers. What are your observations? What is the appearance of the precipitate? Did the blue litmus paper changed in color?arrow_forwardA silver chloride precipitate is a type of gelatinous precipitates * True Falsearrow_forward
- Based on the solubility observations, would you except potassium and bromide to form a precipitate, and would you except sodium and nitrate to form a precipitate ? Yes or no ?arrow_forwardThe addition of hydrochloric acid to the solution of containing the silver group of cations is to selectively precipitate out the lead(II) ions. O True O Falsearrow_forwardIf the barium sulfate precipitate is not dried thoroughly, will the experimentally determined concentration be higher or lower than the true value? Concisely explain based on how the molarity is calculated.arrow_forward
- A student found two bottles of compounds with missing labels. The compounds are either Benzyl chloride or Bromobenzene. To figure out the contents of each bottle, the student put 2 drops of each compound into separate test tubes labeled X and Y and added 1 mL of a mixture of NaI and acetone to each tube. After 45 seconds, the student observed a white color precipitate in tube X, while there was no precipitate formed in tube Y. What compound (Benzyl chloride or Bromobenzene) does tube X contain? Whyarrow_forwardWhy is it normal to add a slight excess of silver nitrate solution when precipitating chloride ion?arrow_forwardWhat ion is reduced when a precipitate which may contain Barium Chromate is added with HCl and concentrated? (chemical formula of the resulting reduced ion)*arrow_forward
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