The statement, to avoid a violent reaction and splattering while diluting solutions, always pour concentrated solutions into water or into less concentrated solutions, while stirring, is true.
A concentrated solution is regarded as the one which has a relatively large amount of dissolved solute. A dilute solution is one which tends to have a relatively small amount of dissolved solute.
In order to minimize reaction and splattering, it is quite better that to pour higher concentrated solution into the lower one. As the higher concentration tends to mean that the solution is quite heavier and it will be thus easier to spread.
Hence, one must remember to wear appropriate protective device when working in the lab.
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