concentration of solution URGENT

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[匿名]

2007-02-20 9:39 am

adding 250cm3 H2O to 10g of 0.1M solid anhydrous sodium carbonate
what is the concentration of sodium carbonate in the solution?

更新1:

to furuta027 no, i mean mixing 250cm3 of H2O , with unknown grams of solid anhydrous sodium carbonate which concentration is 0.1M (to dissolve the solid anhydrous sodium carbonate) and calculate the concentration of the final mixture/solution

回答 (2)

2007-02-20 10:40 am

✔ 最佳答案

no of mol of Na2CO3 =10/(23x2+12+16x3)
=0.094mol
M/V=0.1M
V=0.94dm^3
the new concentration of NaCO3:
=[(0.1)(0.94)]/(0.25+0.94)
=0.079M

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furuta027

2007-02-20 5:29 pm

10g of 0.1M solid anhydrous sodium carbonate係乜?
係唔係10g既水有0.1M既NaCO3?
我假設係咁....
因為水既密度=1gcm-
並假設NaCO3無影響密度
mole of NaCO3=0.1*10/1000
=0.1*10(-3)
0.1*10-3/260/1000
=3.85*10(-3)M

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