The student prepares the NaOH solution of high purity but unknown concentration

Question

The student prepares the NaOH solution of high purity but unknown concentration by taking about 5 mL of the supernatant at the top of the saturated solution adding it to a plastic bottle with about 1 L of freshly distilled or deionized water. The bottom of the solution contains some white solids which are likely to be (select all correct answers

The choices are: A) water(s) B) sodium hydrogen sulfate C) phthalic acid D) CO2 (s) E) sodium slicate F) sodium hydroxide G) sodium hydrogen carbonate

P.S. I picked A, F, G and was marked incorrect

Explanation / Answer

Correct options are F) sodium hydroxide G) sodium hydrogen carbonate only.

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