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Lesson 3: Quantitative Chemical Analysis – Volumetric and Gravimetric Methods — Picture questions (exam style)

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1.
2.5 g of impure Na₂CO₃ is made up to 250 mL; 20 mL is titrated with 0.05 M HCl (burette shown). Which option is correct?
2.5 g of impure Na₂CO₃ is made up to 250 mL; 20 mL is titrated with 0.05 M HCl (burette shown). Which option is correct?
HCl volume needed = 34 mL, purity = 20%
HCl volume needed = 67.9 mL, purity = 90%
HCl volume needed = 67.9 mL, purity = 81%
HCl volume needed = 84.9 mL, purity = 100%
2.
The titration curve (pH vs volume added) is shown. Which indicator is suitable?
The titration curve (pH vs volume added) is shown. Which indicator is suitable?
either methyl orange or phenolphthalein
phenolphthalein
no suitable indicator
methyl orange
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