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potato3999
04.12.2019 •
Chemistry
What is the ph of a 0.0042 m hydrochloric acid solution?
a) 5.47
b) 11.62
c) 7.00
d) 8.53
e) 2.38
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Ответ:
E) 2.38
Explanation:
The pH of any solution , helps to determine the acidic strength of the solution ,
i.e. ,
Lower the value of pH , higher is its acidic strengthand ,
Higher the value of pH , lower is its acidic strength .pH is given as the negative log of the concentration of H⁺ ions ,
hence ,
pH = - log H⁺
From the question ,
the concentration of the solution is 0.0042 M , and being it a strong acid , dissociates completely to its respective ions ,
Therefore , the concentration of H⁺ = 0.0042 M .
Hence , using the above equation , the value of pH can be calculated as follows -
pH = - log H⁺
pH = - log ( 0.0042 M )
pH = 2.38 .
Ответ:
The liquid state of matter can do this, as its atoms aren’t as tightly connected as the ones in solids. Imagine you have a big pile of marbles. In this analogy, solids would be strong magnetic marbles, which, once formed, would keep their shape. Liquids would be like barely bonded marbles, basically loose, which would accomodate themselves to the bowl where they would be in. And gas would be floating marbles, flying around, spreading whenever empty space can be found.