KSEAB II PUC Chemistry case studies
KSEAB II PUC Chemistry · Put your knowledge to work in context.
The Karnataka School Examination and Assessment Board (KSEAB) II Pre-University Course (PUC) Chemistry examination is the state-level board assessment taken at the end of the second year of pre-university study in Karnataka. It is intended for students who have completed the prescribed two-year PU chemistry curriculum and need a board-certified result for university admission, professional-course eligibility, or employment. The KSEAB II PUC Chemistry case studies are 5 cases and about 3,769 words.
1Washing Soda Purity from Two Endpoints and a Burette Bubble
In a school laboratory, a student is asked to determine the percentage purity of a sample of washing soda (Na2CO3·10H2O, molar mass 286 g mol−1) using a standard 0.100 M HCl solution. The student weighs 2.50 g of the impure sample, dissolves it in distilled water, and makes the solution up to 250.0 mL.
765 words, about 4 min2Adjusting an Acetate Buffer While Keeping Fe2+ Available
A biochemistry student needs 100.0 mL of 0.100 M acetate buffer at pH 5.00 for an enzyme assay. The stock solutions are 0.100 M acetic acid (Ka = 1.8 × 10−5) and 0.100 M sodium acetate.
806 words, about 4 min3Copper Plating Efficiency and an Inhibitor Below Specification
A workshop student copper-plates a steel coupon in an acidified CuSO4 bath. The coupon is weighed before and after plating: mass gain 0.250 g.
736 words, about 4 min4An Unlabelled Propanol Bottle and a Failed Propanoic Acid Synthesis
A student finds a bottle labelled only “propanol” and needs to prepare propanoic acid by oxidation. The bottle’s contents are clear and miscible with water.
742 words, about 4 min5Cobalt Ammine Complexes: Charge, Magnetism and Oxidation State
A student prepares two cobalt ammine complexes by the air-oxidation route from CoCl2·6H2O, NH4Cl, concentrated NH3, and H2O2. Complex A is orange-yellow.
720 words, about 4 min