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Juli2301 [7.4K]
3 years ago
15

Whats principle of Aristotle's do scientist use today

Chemistry
1 answer:
Darina [25.2K]3 years ago
6 0
His observation and census.
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Ni3(PO4)2 is a precipitate.

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250 mL of a solution of calcium oxalate is the evaporated until only a residue of solid calcium
Lana71 [14]

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2.3 * 10^-5

Explanation:

Recall that the solubility of a solute is the amount of solute that dissolves in 1 dm^3 or 1000cm^3 of solution.

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Amount of calcium oxalate = 154 * 10^-3/128.097 g/mol = 1.2 * 10^-3 mols

From the question;

1.2 * 10^-3 mols dissolves in 250 mL

x moles dissolves in 1000mL

x = 1.2 * 10^-3 mols * 1000/250

x= 4.8 * 10^-3 moldm^-3

CaC2O4(s) ------->Ca^2+(aq) + C2O4^2-(aq)

Hence Ksp = [Ca^2+] [C2O4^2-]

Where;

[Ca^2+] = [C2O4^2-] = 4.8 * 10^-3 moldm^-3

Ksp = (4.8 * 10^-3)^2

Ksp = 2.3 * 10^-5

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3 years ago
The student who performed this experiment in the question above wrote the following discussion: "The gas sample is known to cont
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