Firstly, sorry if this is the wrong form, I can move it if so, I tried my best.
Long story short, I was preparing 30% TCA solution as follows: 30g TCA into 100mL H2O.
However, my supervisor is telling me that this only equates to about a 14% solution?
His reasoning was that, a different protocol calls for 30 mL of 6.1N TCA to be combined with 70 mL of H2O. He explained that 6.1N TCA is made using 2.2g TCA into 1 mL of H20, which equals 100% (w/v). I do not understand this math at all. How could 2.2/1 = 100% and not 220%?
I'm probably missing something basic here and making a fool of myself, but I would really appreciate learning from someone! Thank you!