Chemistry · Paper 2A · 2024
2 questions 🇹🇿 NECTA ✓ Official NECTA answersChemistry · Paper 2A · 2024
2 questions
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An acidic compound with a coded chemical formula HX is useful for small scale industries; therefore, it has to be identified and its exact concentration must be known. A beaker labeled C contains a solution prepared by dissolving 0.9125 g of HX in 100 cm3 of solution. You are also provided with a standard solution in a beaker labeled D prepared by dissolving 1.00 g of NaOH in 250 cm3 of solution and methyl orange as an indicator. Perform the activities listed in the procedure in order to identify the concentration of HX. Procedure: (i) Pipette 20 cm3 or 25 cm3 of solution D and transfer it into a titrating flask. Add three drops of methyl orange indicator in the titrating flask. (ii) Titrate this mixture with solution C until a permanent colour change is observed. (iii) Repeat procedures (i) - (ii) for three times.
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