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.

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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.