You have to identify an unknown compound, x. a. From the results of the tests above, and
Question:
You have to identify an unknown compound, x.
a. From the results of the tests above, and the Tables of Qualitative Analysis, identify the cation present in x.
b. Suggest another reagent to confirm the cation present in x giving the predicted observation.
c. Suggest the identity of x.
Observations made Test To a small spatula measure of sodium carbonate in a test White ppt tube, add enough distilled water to make a solution. Add 1cm depth of X solution. White ppt To a small spatula measure of sodium sulfate in a test tube, add enough distilled water to make a solution. Add 1cm depth of X solution. Tolcm depth of X solution in a test tube, add aqueous sodium hydroxide. White ppt that is soluble in excess sodium hydroxide Brown gas is given off (nitrogen dioxide is a brown gas). The gas re-lights a glowing splint (showing oxygen is present). The solid turns yellow and crackles as it is heated. Carefully heat the solid X in the test tube provided. Note: two gases are released.
Step by Step Answer:
Part A In the first test the cation of the unknown solution X reacts with sodium carbonate to form a...View the full answer
Cambridge International AS And A Level Chemistry Coursebook
ISBN: 9781316637739
2nd Edition
Authors: Lawrie Ryan, Roger Norris
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The experiment aims to show the impact of various beverages on teeth by using eggs as a representation of enamel. Three eggs are boiled and then placed in glasses filled with fizzy drinks, vinegar, and mango juice for 24 hours. The shells of eggs are similar to enamel as they are composed of calcium carbonate, and enamel is primarily made of calcium phosphate. The eggs are then observed to demonstrate the effects of the different liquids on teeth and the importance of brushing regularly. The egg placed in fizzy drink has turned dark in color but can be cleaned by brushing with toothpaste and rinsing with water. The egg placed in vinegar has had its shell softened due to the chemical reaction of vinegar and calcium carbonate, which can\'t be reversed. This highlights the fact that acids are more damaging to teeth than other substances. The egg placed in mango juice represents the process of bacteria in the mouth converting sugars and starches into acids that form plaque, which can be prevented by brushing. The use of fluoride in toothpaste is also highlighted as it slows down the demineralization process and protects the enamel. The importance of brushing teeth twice a day is emphasized.
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