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# Accuracy Watch

1. Q: The sodium thiosulfate solution was prepared by dissolving 4.5 g of sodium thiosulfate in water and making the solution up to 250 cm^3 in a volumetric flask. The volumetric flask is accurate to 0.3 cm^3 so, to match this accuracy, the mass of the sodium thiosulfate should be accurate to at least

A. 0.5 g
B. 0.05 g
C. 0.005 g
D. 0.0005 g

The answer is C. But why??? I have no clue at all

Please teach me(
2. (Original post by mystreet091234)
Q: The sodium thiosulfate solution was prepared by dissolving 4.5 g of sodium thiosulfate in water and making the solution up to 250 cm^3 in a volumetric flask. The volumetric flask is accurate to 0.3 cm^3 so, to match this accuracy, the mass of the sodium thiosulfate should be accurate to at least

A. 0.5 g
B. 0.05 g
C. 0.005 g
D. 0.0005 g

The answer is C. But why??? I have no clue at all

Please teach me(
Calculate the percentage inaccuracy by 100 x 0.3/250

Now take this percentage of the mass needed.
3. (Original post by charco)
Calculate the percentage inaccuracy by 100 x 0.3/250

Now take this percentage of the mass needed.
To match the accuracy, they should have same percentage uncertainty?
4. (Original post by mystreet091234)
To match the accuracy, they should have same percentage uncertainty?
I guess. Although in practical terms this is highly unlikely

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