Posted by j on Monday, October 4, 2010 at 2:13am.
Start from the equation
Li + H2O -> LiOH + H2
which you will need to balance.
In water
LiOH -> Li+ + OH-
so one mole of LiOH gives one mole of OH-. From the balanced equation you can work out how many moles of LiOH are obtained from one mole of Li metal.
Calculate the number of moles of Li metal
number of moles = 5.500 g/ RAM for Li
hence find number of moles of LiOH, which equals number of moles of OH-
[OH-] = number of moles of OH-/0.750 litre
take care with the significant figure as well.
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