The zeisel method is an analytical procedure for determining the number of methoxyl groups in a compound. a weighed amount of the compound is heated with with concentrated hi, ether cleavage occurs, and the iodomethane product is distilled off and passed into an alcohol solution of agno3, where it reacts to form a precipitate of silver iodide. the agi is then collected and weighed, and the percentage of methoxyl groups in the sample is thereby determined.
1.06 g of vanillin yields 1.64 g of agi. if vanillin has a molecular weight of 152, how many methoxyl groups does vanillin contain?

1 molecule of vanilin contains 1 methoxy group

Explanation:

In the Zeisel method 1 mole of AgI is equivalent to 1 mole of methoxyl group.

1,64g of AgI are:

1,64g AgI× = 6,99x10⁻³ moles of AgI ≡ moles of methoxy groups.

1,06g of vanilin are:

1,06g vanilin× = 6,97x10⁻³ moles of vanilin

The ratio of moles of methoxy groups/moles of vanilin is:

6,99x10⁻³ moles/6,97x10⁻³ moles = 1,00

That means that 1 molecule of vanilin contains 1 methoxy group.

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pure water does not conduct electricity very well. however, when certain substances are dissolved in water, the solution does conduct electricity. you can make a simple device that shows how well a solution conducts electricity. this device uses a flashlight bulb to indicate how well the solution conducts electricity. the better the solution conducts electricity, the brighter the bulb will glow.

explanation: