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:
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Δ = 2 -
2. 5%- ( b).
3. (b).
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4. .
5. . .
:
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:
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:
1. , , 2 3.
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2. 5% Na2S04?
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3. 37.
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4. , ?
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5. , , (10%) (20%).
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1.1.4.
: . .
: - , , , - .
3