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.

1. Present your results in an appropriate table of results. (4 mk)
2. Calculate the average titre volume of C. (3 mk)
3. With state symbols included, write a balanced chemical equation for the reaction between solutions contained in bottles labeled C and solution D. (3 mk)
4. Calculate the concentration of NaOH in solution D in moles per dm3. (4 mk)
5. Identify element X in compound HX. (3 mk)
6. Write a balanced chemical equation representing the reaction which will occur when X is reacted with water. (2 mk)

Upgrade to see model answers.