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I think so, I'll confirm answer tomorrow

A student was asked to determine the mass, in grams, of calcium carbonate present in a 0.125g sample of chalk. The student placed the chalk sample in a 250mL conical flask and added 50mL of 0.2mol/L HCl using a pipette. The excess HCl was then titrated with 0.25 mol/L NaOH. The average NaOH...

HAHAHAHA i thought you went to sleep

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Bold part - You repeated yourself. Strong physics/10 haha 4/4

Thankyou!

You're supposed to know either the lead acid or dry cell with another one! Lead acid cell is better, because if you get a question to do with environment, dry cell has nothing, and you're pretty much screwed.

UGLY question

Does anyone happen to remember the polynomial they got for 12c? The one with roots being 1/alpha + 1/beta, etc etc

Okay move one, some one rounded, everyone is correct -.- New question : Why are indicators used? 3 marks.

SSH is right

Hence why the rote learners in math will tend to do bad in HSC papers as questions are more application based. Their not textbook questions, or predictable trial papers.

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I meant 4u maths lol

Yeap :p

Bold part - I agree and i am one of the minority who love both the subjects and are doing well :p hahah what's your definition of well? Out of 120 what do you think is 'well', in HSC papers or trial papers whichever you prefer

Can you fuck off.

A 0.2845 g sample of impure sodium carbonate required 24.65 mL of an HCl solution for titration. A 0.2204 g sample of pure sodium carbonate required 20.06 mL of the HCl solution of the same concentration. What is the percentage of sodium carbonate in the sample?

MATHS IS LIFE. There is no memory involved.

Do you also do 4u math?