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2 years ago

What is the ph of a 0.034 m hydrochloric acid solution?

Chemistry

2 answers:

Law Incorporation [45]2 years ago

8 0

PH= -log [H+]
= - (log 0.034)
= - (-1.5)
= 1.5

leva [86]2 years ago

4 0

Answer: The pH of the given HCl solution is 1.47

Explanation:

We are given:

Molarity of HCl = 0.034 M

1 mole of HCl produces 1 mole of hydrogen ions and 1 mole of chlorine ions.

pH is defined as negative logarithm of hydrogen ion concentration. It is basically defined as the power of hydrogen ions in a solution.

Mathematically,

$pH=-\log[H^+]$

We are given:

$[H^+]=0.034M$

Putting values in above equation, we get:

$pH=-\log(0.034)\\\\pH=1.47$

Hence, the pH of the given HCl solution is 1.47

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What is the lower concentration limit (vol%) at which a mixture of ethanol in air can explode?

liubo4ka [24]

Answer:

Lower explosive limit (LEL) of ethanol = 3.3%

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General properties and comparison with other inflambles products:

Flash point momentary Gasoline = -45 ° F

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Lower explosive limit (LEL) of ethanol = 3.3%

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3 years ago

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Aneli [31]

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Explanation:

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As we can see in the information given in the question, the specific heat capacity of zinc is the lowest as compared to steel, water and aluminium. Hence, zinc is the correct option.

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3 years ago

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Vesna [10]

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Explanation :

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As per first law of thermodynamic,

$\Delta E=q+w$

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$\Delta E$ = internal energy of the system

q = heat added or rejected by the system

w = work done

As we are given that:

q = 38.65 kJ

w = -2.47 kJ (system work done on surrounding)

Now put all the given values in the above expression, we get:

$\Delta E=38.65kJ+(-2.47kJ)$

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3 years ago

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3 years ago