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2 years ago

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HELP!!!! Will mark give 5 stars and thank!! Please!

1 answer:

Aloiza [94]2 years ago

7 0

Answer:

An endothermic reaction is a reaction where heat is taken in from the surroundings. This could be in the process of vaporisation from liquid to gas. However an exothermic reaction is when heat is given out to the surroundings. An example of this would be condensation gas to liquid!

Explanation:

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Which of the following is the best definition of a scientific theory?Help me plz

tatiyna

A scientific theory is a well tested explanation of a natural phenomenon.

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3 years ago

A solution contains 0.45 M hydrofluoric acid (HF; KA = 6.8 X 10−4). Write the dissociation reaction. Determine the degree of ion

Gala2k [10]

Answer:

Degree of ionization = 0.0377

pH of the solution = 1.769

Explanation:

Initial concentration of HF = 0.45 M

$K_a = 6.8 \times 10^{-4}$

$HF \leftrightharpoons H^+ + F^-$

Initial 0.45 0 0

At equi 0.45 - x x x

Equilibrium constant = $\frac{[H^+][F^-]}{HF}$

$6.8 \times 10^{-4}= \frac{[x][x]}{0.45 - x}$

$x^2 + 6.8 \times 10^{-4} x - 6.8 \times 10^{-4} \times 4.5 = 0$

x = 0.017 M

x = Cα

α = Degree of ionization

C = Concentration

Degree of ionization = $\frac{0.017}{0.45} = 0.0377$

$pH = -log[H^+]$

[H^+]=0.017 M

$pH = -log[0.017]$

= 1.769

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