Science Buddies: "Ask an Expert"

In my experiment I used Sodium Bicarbonate NaHCO3, to improve the conductivity of the water. However I am unsure of the effect of the molarity of this solution on the gas volumes and ratios, which should presumably come in a 2:1 ratio?

In addition, I would like to know what is meant by the term "valid" when used in relation to a scientific investigation.

Hi Draconeous,
A valid scientific investigation is one that has meaningful results. Perhaps it is more revealing to say that an invalid scientific investigation is one that has experimental flaws that render the results meaningless. For example, a critic might say that an experiment is invalid because it uses an insufficient number of samples to test the hypothesis.

With regards to your first question, you might get some insight from the comment at the very bottom of this web page ("Using different concentrations"):
http://www.science-projects.com/Electro ... s.htm#note

@ Chris G: Thank you very much, your information has been very helpful