3: (10 points) Free cyanide in aqueous solution can be determined indirectly by

Question

3: (10 points) Free cyanide in aqueous solution can be determined indirectly by atomic absorption based on its ability to dissolve silver as it passes through a porous silver membrane filter at pH 12: 4 Ag(s) + 8 CN- + 2 H2O + O2 4 Ag(CN)2 + 4 OH- A series of silver standards gave a linear calibration (slope) of 700 meter units per ppm. (The meter units are arbitrary numbers related to absorbance, and ppm = mg /L). An unknown cyanide solution passed through the silver membrane and gave a reading of 411 meter units. Find the molarity of CN in the unknown. FYI: The molecular weight of Ag is 107.868 g/mol noitasiliaslov bne noissiludon

Explanation / Answer

MOLARITY-NO. of molesof solute present in 1L of solution is called molarity. In the above question we have to find molarity of cyanide ion .

mg/l means weight/volume

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