3 years ago

ANSWER BC MY LIFE DEPEDNDS ON IT

Chemistry

1 answer:

Vaselesa [24]3 years ago

8 0

It’s 4: The mixture is forced through a filter which traps and separates out the substances too large to go through it.

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Name the type of reaction and give the coefficients needed to balance the following skeleton reaction: ___Mg + ___Fe2O3 → ___Fe

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3 Mg + 1 Fe2O3 →2 Fe + 3MgO
Type of Reaction: Single displacement.

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How did Dmitri Mendeleev arrange the periodic law?

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In a titration of nitrous acid with NaOH, the pH of the solution is 3.14 when the moles of HNO2 and the moles of NO2-- are equal

jonny [76]

Answer:

$Ka=3.98x10^{-4}$

Explanation:

Hello there!

In this case, since the modelling of titration problems can be approached via the Henderson-Hasselbach equation to set up a relationship between pH, pKa and the concentration of the acid and its conjugate base, we can write:

$pH=pKa+log(\frac{[NO_2^-]}{[HNO_2]} )$

Whereas the pH is given as 3.14 and the concentrations are the same, that is why the pH would be equal to the pKa as the logarithm gets 0 (log(1)=0); thus, we can calculate the Ka via:

$Ka=10^{-pKa}=10^{-3.14}\\\\Ka=3.98x10^{-4}$