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Thanks you guys rock! for answering my question

so don't use "Bromothymol blue since NaCl is neutral."? and you mean you can use either?

but doesn't this titration have two equivalence points? i'm so confused

what indicator do you use for sodium carbonate and HCl titration?

how do you find the volume of NO2 in this reaction? do i use the moles of NO or O3 if the question tells you that NO weighs 0.66g and O3 weighs 0.72g NO (g) + O3 (g) --> NO2 (g) + O2 (g)

I have an experiment where magnesium is wrapped around a nail and placed in a petri dish filled with agar/saltwater and indicators to locate anode and cathode. The nail does not corrode beacuse its oxidation reaction has been stifled. Only query is: a white substance has formed around the...

cheers.:)

thanks heaps i sort of get it. In an exam situation could i just find the absolute value of it? because the answer i got was negative but is this always the case when you don't make the area (x-0)dy?

why does area = (0-x) ??/

how do you solve the area bounded by the curve y= ln(x+4) the y-axis, y=0 and y=1 because i got (e-5) units2 but the solution says (5-e)units 2 is this bit right x+4 = e^y from y=ln(x+4)? be grateful for anyone who can help.

thanks i understand now before i made k=0.2 btw=11.4 :)

how do you do this question A population in a certain city is growing at a rate proportional to the population itself. After 3 years the population increases by 20%. How long will it take for the population to double?

does anyone have anymore helpful sites for baxuite?