Posted by chris on Thursday, June 4, 2009 at 7:08pm.
mL x M = mL x M.
250mL x 0.20 M = mL x 1.0 M
solve for mL of 1.0 M NaCl.
Then ? mL of 1.0 M NaCl in a 250 mL volumetric flask, and make to the mark with water.
another way to think on this is that you are diluting it by 5 times, so you need four parts water and one part concentrate.
1Part=50ml 1.0M NaCl
4 parts water: 200ml
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