Don't make these 8 common mistakes in your HSC or HSC Trial exams.
Read the 8 Common Mistakes Chemistry Students Make in the HSC Exam. Learn the errors HSC students are making and avoid them.
2HCl(aq) + Na2CO3(s) → 2NaCl(aq) + CO2(g) + H2O(l)
YEAR 12 CHEMISTRY STUDENTS ARE REQUIRED TO MEMORISE THE SOLUBILITY RULES.
The final answer of all calculation questions must contain the correct number of significant figures. Remember: You are only as accurate as your least accurate value!
To calculate the number of significant figures for HSC Chemistry, use these rules:
Calculate the mass of NaCl required to form a 250.0 mL solution with a concentration of 2.00 mol L-1.
n(NaCl) = c(NaCl) x V(NaCl) = 2.00 mol L-1 x 0.250 L = 0.500 mol
m(NaCl) = n(NaCl) x MM(NaCl) = 0.500 mol x 58.44 g mol-1 = 29.2 g (3 sig figs)