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chemistry help with molarity

Chemistry
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If 7.O mL of a 6.O M NaOH are diluted with water to a volume of 400mL, what is the molarity of the resulting solution?

Jun 25th, 2014

solution

number of mols of a substance in any solution = (molarity)(volume) - if the volume is in dm-3 

number of mols of a substance in any solution = (molarity)(volume) / 1000 if volume is in cm3 

therefore 1a) 

mols = (7)(6) /(1000) 
= 0.042 mol 

1b) molarity = number of mols / Volume (convert all volumes to dm-3 before using this formula) 

molarity = (0.042) / (400/1000) 
= 0.105 mol dm-3 

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Jun 25th, 2014

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