3 years ago

How is boiling water different from burning gasoline?

Chemistry

1 answer:

cluponka [151]3 years ago

6 0

Boiling water is a physical change while burning gasoline is a chemical change.

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The kw for water at 0 °c is 0.12× 10–14 m2. Calculate the ph of a neutral aqueous solution at 0 °c.

jekas [21]

Answer:

pH = 7.46.

Explanation:

The ionization of water is given by the equation :

H₂O(l) ⇄ H⁺(aq) + OH⁻(aq),

The equilibrium constant (Kw) expression is:

Kw = [H⁺][OH⁻] = 0.12 x 10⁻¹⁴.

in pure water and neutral aqueous solution, [H⁺] = [OH⁻]

So, Kw = [H⁺]²

∴ 0.12 x 10⁻¹⁴ = [H⁺]²

∴ [H⁺] = 3.4 x 10⁻⁸ M.

∵ pH = - log [H⁺]

pH = - log (3.4 x 10⁻⁸) = 7.46.

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3 years ago

How many milliliters are in 17.5 l? 175 ml 1.75 x 10-2 ml 1.75 x 103 ml 1.75 x 104 ml?

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1.75 x 104 is the correct answer

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Digoxin is available in a concentration of 0.1 mg/ml. How many ml are required to administer a 75 mcg dose?

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Answer : The volume required to administer a 75 mcg dose are, 0.75 mL

Explanation : Given,

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That means, 0.1 mg of Digoxin present in 1 mL of solution.

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Conversion used : (1 mcg = 0.001 mg)

Now we have to determine the volume required to administer a 75 mcg dose.

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So, 0.075 mg of Digoxin required in $\frac{0.075mg}{0.1mg}\times 1mL=0.75mL$ of solution

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faust18 [17]

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