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Vadim26 [7]
3 years ago
13

He concentration of pb2+ in a commercially available standard solution is 1.00 mg/ml. what volume of this solution should be dil

uted to 5.0×102 ml to produce a solution in which the concentration of pb2+ is 0.055 mg/l?
Chemistry
1 answer:
Nina [5.8K]3 years ago
6 0

This can be directly solved using the formula:

C1 V1 = C2 V2

where C is concentration and V is volume

 

1.00 mg/ml * V1 = 0.055 mg/1000 ml * (5.0 x 10^2 ml)

V1 = 0.0275 ml

 

<span>So 0.0275 ml is needed to be diluted to 5.0 x 10^2 ml</span>

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Answer:

a. N₂O₅ + H₂O ⇒ 2 HNO₃ (pentóxido de dinitrógeno + agua ⇒ ácido nítrico)

b. Na₂O + H₂O ⇒ 2 NaOH (óxido de sodio + agua ⇒ hidróxido de sodio)

Explanation:

Tenemos que balancear, por el método de tanteo, las siguientes ecuaciones químicas.

a. En la primera reacción, el pentóxido de dinitrógeno reacciona con agua para formar ácido nítrico. Es una reacción de síntesis o combinación.

N₂O₅ + H₂O ⇒ HNO₃

Podremos obtener la ecuación balanceada si multiplicamos HNO₃ por 2.

N₂O₅ + H₂O ⇒ 2 HNO₃

b. En la segunda reacción, óxido de sodio reacciona con agua para formar hidróxido de sodio. Es una reacción de síntesis o combinación.

Na₂O + H₂O ⇒ NaOH

Podremos obtener la ecuación balanceada si multiplicamos NaOH por 2.

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2 years ago
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Answer:

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3 years ago
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3 years ago
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A sample of a mineral solid weighing 28.5 g was added to a graduated cylinder filled with to a level of 20.3 mL. As a result, th
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Answer:

2.8 g/mL is the density of the mineral.

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The expression for the calculation of density is shown below as:-

\rho=\frac{m}{V}

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