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2 years ago

The text of oxygen gas in the laboratory

Chemistry

1 answer:

IgorC [24]2 years ago

8 0

Explanation:in testing for oxygen a glowing splint is used.

the glowing splint is brought in the presence of the test tube containing the gas

the glowing splint rekindles or lights up showing that oxygen is present.

this is a positive test because oxygen supports burning or combustion

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Answer: a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.

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2 years ago

A buffer is composed of nh3 and nh4cl. How would this buffer solution control the ph of a solution when a small amount of a stro

Shkiper50 [21]

Answer:

According to Le-chatelier principle, equilibrium will shift towards left to minimize concentration of $OH^{-}$ and keep same equilibrium constant

Explanation:

In this buffer following equilibrium exists -

$NH_{3}(aq.)+H_{2}O(l)\rightleftharpoons NH_{4}^{+}(aq.)+OH^{-}(aq.)$

So, $OH^{-}$ is involved in the above equilibrium.

When a strong base is added to this buffer, then concentration of $OH^{-}$ increases. Hence, according to Le-chatelier principle, above equilibrium will shift towards left to minimize concentration of $OH^{-}$ and keep same equilibrium constant.

Therefore excess amount of $OH^{-}$ combines with $NH_{4}^{+}$ to produce ammonia and water. So, effect of addition of strong base on pH of buffer gets minimized.

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3 years ago

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Harman [31]

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${\boxed{ \fbox{ \fbox{ \fbox{ \red{hello}}}}}}$

${\boxed{ \fbox{ \fbox{ \fbox{ \green{hello}}}}}}$

${\boxed{ \fbox{ \fbox{ \fbox{ \pink{hello}}}}}}$

▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ $\mathscr \fcolorbox{blue}{green}{BE \: BRAINLY}$ ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ $\mathscr \fcolorbox{blue}{blue}{BE \: BRAINLY}$ ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ $\mathscr \fcolorbox{blue}{red}{BE \: BRAINLY}$ ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ $\mathscr \fcolorbox{blue}{gray}{BE \: BRAINLY}$ ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬

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2 years ago

I bet no one can solve this

Nikitich [7]

The answer is 89.4 g/mol cuz the two units carry positives so that means 8.50 flows for 2 more hours than usual.

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3 years ago

If one adds 0.1 mol of the weak acid hf (pk_a = 3.2) to a solution with a ph = 2, which species would be most abundant and how m

zavuch27 [327]

$F^{-}$ is most abundant and 6310 times more than HF.

<h3>What is a strong and weak acid?</h3>

When an acid is dissolved in water, all of its molecules disintegrate, making the acid powerful.

When an acid is dissolved in water, only a small number of its molecules disintegrate, making the acid weak. Strong acids have a lower pH than weak acids.

The powerful acids include perchloric acid, chloric acid, nitric acid, sulfuric acid, hydrobromic acid, and hydroiodic acid.

Given:

Pka=3..2

pH=7

Let the volume be 1 liter

[HF]=01 M

$pH=pka+log \frac{F^{-}}{HF} \\\\7=3.2+log\frac{F^{-}}{HF} \\3.8=log\frac{F^{-}}{HF}\\ \frac{F^{-}}{0.1}=10^{3.8} \\F^{-}=630.95 M$

Now,

$\frac{F^{-}}{HF}=\frac{630.95}{0.1}\\ =6309.57$

F-:HF= 6309.57:1

Therefore, the most abundant is $F^{-}$ and has 6310 times more than HF is $F^{-}$ .

To know more about strong and weak acids, visit: brainly.com/question/12811944

#SPJ4

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1 year ago

The text of oxygen gas in the laboratory ​

The text of oxygen gas in the laboratory