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4 years ago

What are two ways in which mixtures differ from compounds

1 answer:

3 0

A mixture contains 2 or more substances mixed together but a compound is 2 or more different atoms chemically bonding together

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A volume of 500.0 mL of 0.160 M NaOH is added to 585 mL of 0.200 M weak acid ( K a = 1.28 × 10 − 5 ) . What is the pH of the res

Hitman42 [59]

Answer : The pH of the resulting buffer is, 5.22

Explanation : Given,

$K_a=1.28\times 10^{-5}$

First we have to calculate the moles of $NaOH\text{ and }HA$

$\text{Moles of }NaOH=\text{Concentration of }NaOH\times \text{Volume of solution}}=0.160M\times 0.500L=0.08mol$

and,

$\text{Moles of }HA=\text{Concentration of }HA\times \text{Volume of solution}}=0.200M\times 0.585L=0.117mol$

The balanced chemical reaction is:

$HA+(aq)+OH^-(aq)\rightarrow H_2O(l)+A^-(aq)$

Moles of HA left = 0.117 mol - 0.08 mol = 0.037 mol

Moles of $A^-$ = 0.08 mol

The expression used for the calculation of $pK_a$ is,

$pK_a=-\log (K_a)$

Now put the value of $K_a$ in this expression, we get:

$pK_a=-\log (1.28\times 10^{-5})$

$pK_a=5-\log (1.28)$

$pK_a=4.89$

Now we have to calculate the pH of buffer.

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

$pH=pK_a+\log \frac{[A^-]}{[HA]}$

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

$pH=4.89+\log (\frac{0.08}{0.037})$

$pH=5.22$

Thus, the pH of the resulting buffer is, 5.22

5 0

4 years ago

Can a compound have more than one carbon-carbon double bond in it?

kiruha [24]

Answer:

yes, a compound can have more than one carbon-carbon double bond

4 0

3 years ago

Samaira needs to rent some tents for an outdoor family reunion in July. What is the best type of tent for Samaira to rent so tha

SVETLANKA909090 [29]

Answer:

The correct answer is rough, white tents

Explanation:

The options that have black tents are wrong because black materials absorbs heat, hence cannot protect the family from the heat from the sun during the reunion.

Also light/heat energy easily penetrate smooth surfaces as against rough surfaces. From this explanation, rough, white tents are better for the reunion as they will protect the family from the heat radiated from the sun.

8 0

4 years ago

Read 2 more answers

Preserved remains have turned to what?

Softa [21]

It depends on what the remains are. If you are looking for a word, it could either be fossils or if it is something that has preserved the soft tissue it can be described as mummified.

3 0

3 years ago

The half-life of the radioactive element unobtanium dash 53 is 20 seconds. if 32 grams of unobtanium dash 53 are initially pre

Lelu [443]

when the half-life is the amount of time which the radioactive isotopes need to

be in half.

So when w start with 32 g of unobtanium 53 so :

1- after 20 sec the number of grams remain = 32/2

= 16 g

2- and after 40 sec the number of grams remain

16 g will cut in half:

= 16 / 2

= 8 g

3- and after 60 sec the number of grams remain

8 g will cut in half:

= 8g /2

= 4 g

4- and after 80 sec the number of grams remain

4 g will cut in half:

= 4 g /2

= 2 g

5-after 100 sec the number of grams remain

2 g will cut in half :

= 2g /2

= 0 g

after 100 sec there are no grams remain

6 0

3 years ago

Read 2 more answers