pag 1-determination of the relative atomic mass of magnesium

Created by: sianxxxxxxxxx
Created on: 18-08-20 10:16

what is the method of the determination of the relative atomic mass of magnesium

complete setup,add 50cm^3 of 1.00moldm^-3 aq H2SO4 to conical flask, weigh 0.12-0.16g of Mg-record exact mass,remove stopper,add Mg and replace, collect gas and record the final volume of hydrogen

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what are the control variables

volume and concentration of H2SO4, madd of magnesium

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what is the dependent variable

volume of hydrogen produced

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what are the observations

effervescence-the bubbles are hydrogen

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what is the equation?

Mg(s) + H2SO4(aq) -> MgSO4(aq) + H2(g)

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what equations are needed?

Pv=nRT, %error x amount of times it was used/result

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how do you find the relative atomic mass

mass/mr of magnesium, , mass of magnesium/(volume of hydrogen produced/24)

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evaluative points that increase relative atomic mass

when Mg is added, hydrogen can escape so there are less moles of hydrogen//other compounds on Mg ribbon react with H2SO4

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evaluative points that decrease relative atomic mass

bung forced into flask, more gas forced//Mg remained on the balance.

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improvements to the experiment

less Mg, more H2SO4 as Mg is more likely to be used up, so vol of gas produced is less than it could be//keep RTP monitored and pressure the same, invert conical flask so that H2SO4 and Mg will mix

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Card 2

Front

what are the control variables

Back

volume and concentration of H2SO4, madd of magnesium

Card 3

Front

what is the dependent variable

Back

Card 4

Front

what are the observations

Back

Card 5

Front

what is the equation?

Back

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pag 1-determination of the relative atomic mass of magnesium