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# Moles Calculations help watch

1. H2x + 2NaOH-----Na2X +2H2O

• You have 25.o cm3 of NaOH of concentration 0.01M
• Your mean titre was 12cm3

Find the concentration of H2X in original 250 cm3 solution?
2. (Original post by chuckynoriss)
H2x + 2NaOH-----Na2X +2H2O

• You have 25.o cm3 of NaOH of concentration 0.01M
• Your mean titre was 12cm3

Find the concentration of H2X in original 250 cm3 solution?
There is a 2:1 ratio of moles in the equation.
Calculate moles of NaOH then divide by two for moles of H2X
Hence find the conc. using the mean titre.
3. so would you do

250/mean tire x moles= moles in 250 cm3

then to find concentration you do moles/250
4. (Original post by chuckynoriss)
so would you do

250/mean tire x moles= moles in 250 cm3
You could do it like that, yes.

(Original post by chuckynoriss)

then to find concentration you do moles/250
Not quite the units of concentration are moldm-3 the given units are cm3
To convert 1000cm3 = 1dm3

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