The question should read “The experiment used 300 g copper chloride in 1 dm^3 of water, how much copper chloride is needed to prepare the same concentration in 50ml”. In this way it's possible for students to apply proportional reasoning or use the formula: Required mass = 300g/1000ml x 50ml = 15g.

It's not unusual !

Geek alert!!! One interesting feature of the polymorph cluster analysis is the symmetric diagonal (from top left to bottom right) contains numbers lower than 100. Can you remember why this is the case as normally these would be blanked out as the expectation would be complete agreement.

Living a simple life...Acetic acid

Short and to the point.....succinic acid

And the angry cousin, sulfurious acid!