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- WAEC Standard for Chemistry Alternative to Practical IIOutline how a 250 cm3 of 0.100 moldm-3 HCl could be prepared from 100 cm3 of a 2.00 moldm-3 stock solution. State the effect of aqueous solutions of each of the following salts on litmus paper:(i) CH3COONa;(ii) Al2(SO4)3;(iii) KNO3. (c) In a redox titration experiment, acidified potassium tetraoxomanganate (VII) solution was titrated against Fe2+ solution. ...Read more
- WAEC Standard for Answering Chemistry Practical (Titration).A is a solution of potassium tetraoxomanganate (VII). B is a solution of iron(II)chloride containing 4.80 g of the salt in 250 cm3 of solution. Put A into the burette. Pipette 20.0 cm3 or 25.0 cm3 of B into a conical flask, add 20.0 cm3 of ...Read more
- WAEC Standard for Answering Solubility.(i) Define the term solubility. (ii) If 1.11g of calcium chloride (CaCl2) were dissolved in 20.0g of distilled water at 20oC, calculate the solubility of the salt in moldm-3. . (i) Solubility of a solute in a solvent at a particular temperature is the maximum amount of the solute in moles ...Read more
- WAEC Standard for Answering Organic ChemistryState two advantages of synthetic polymers over natural polymers. The expected answers include: – cheaper– more durable– can be recycled– easily moulded– lighter– can be made on demand / tailor made– easily available– can be produced in larger quantity– can be formed fasterDraw the structure of the product formed when one mole of ethyne reacts with ...Read more
- WAEC Standard for Answering Balance of Payment.The table below shows the composition of exports and imports of a hypothetical country. Use the information in the table to answer the questions that follow. Exports Amount $ Imports Amount ...Read more