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A household cleaning agent contains a weak base of general formula NaX - HSC - SSCE Chemistry - Question 23 - 2001 - Paper 1
Question 23
A household cleaning agent contains a weak base of general formula NaX. 1.00 g of this compound was dissolved in 100.0 mL of water. A 20.0 mL sample of the solution ... show full transcript
Worked Solution & Example Answer:A household cleaning agent contains a weak base of general formula NaX - HSC - SSCE Chemistry - Question 23 - 2001 - Paper 1
Step 1
Step 2
What is the molar mass of this base?
Answer
To determine the molar mass of the base NaX, we first need to find how many moles of hydrochloric acid were used in the titration.
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Calculate the number of moles of HCl used:
Moles of HCl = Concentration (mol/L) × Volume (L)
= 0.1000 mol/L × 0.0244 L
= 0.00244 molesSince NaX is a weak base that reacts with HCl in a 1:1 ratio, we can conclude that the moles of NaX present are also 0.00244 moles of NaX.
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Calculate the molar mass of NaX:
Molar mass = Mass (g) / Number of moles (mol)
= 1.00 g / 0.00244 mol
≈ 409.84 g/molTherefore, the molar mass of the weak base NaX is approximately 410 g/mol.