It should be 0.25 M. Use the formula C1*V1=C2*V2, for those values, as it is right when it changed colour. Remember to change the if those are not the same (but in your case it is, so no need this time).
C1*V1=C2*V2
C1*27ml=0.55M*12.5ml
C1=(0.55M*12.5ml)/27ml = 0.25M
Answer:
B is the answer because it doesn't matches the num of valence electrons
I believe it’s Chemical energy but please correct me if i’m wrong
The answer is C. Nicotine is the substance found in tobacco smoke that stimulates the brain.
