In ocean water, salt is a(n) _____. a. solution b. alloy c. solvent d. solute

A buffer contains 0.19 mol of propionic acid (C2H5COOH) and 0.26 mol of sodium propionate (C2H5COONa) in 1.20 L. You may want to

Snezhnost [94]

Explanation:

It is known that $pK_{a}$ of propionic acid = 4.87

And, initial concentration of propionic acid = $\frac{0.19}{1.20}$

= 0.158 M

Concentration of sodium propionate = \frac{0.26}{1.20}[/tex]

= 0.216 M

Now, in the given situation only propionic acid and sodium propionate are present .

Hence, pH = $pK_{a} + log(\frac{[salt]}{[acid]})$

= $4.87 + log \frac{0.216}{0.158}$

= 4.87 + log (1.36)

= 5.00

Therefore, when 0.02 mol NaOH is added then,

Moles of propionic acid = 0.19 - 0.02

= 0.17 mol

Hence, concentration of propionic acid = $\frac{0.17}{1.20 L}$

= 0.14 M

and, moles of sodium propionic acid = (0.26 + 0.02) mol

= 0.28 mol

Hence, concentration of sodium propionic acid will be calculated as follows.

$\frac{0.28 mol}{1.20 L}$

= 0.23 M

Therefore, calculate the pH upon addition of 0.02 mol of NaOH as follows.

pH = $pK_{a} + log(\frac{[salt]}{[acid]})$

= $4.87 + log \frac{0.23}{0.14}$

= 4.87 + log (1.64)

= 5.08

Hence, the pH of the buffer after the addition of 0.02 mol of NaOH is 5.08.

Therefore, when 0.02 mol HI is added then,

Moles of propionic acid = 0.19 + 0.02

= 0.21 mol

Hence, concentration of propionic acid = $\frac{0.21}{1.20 L}$

= 0.175 M

and, moles of sodium propionic acid = (0.26 - 0.02) mol

= 0.24 mol

Hence, concentration of sodium propionic acid will be calculated as follows.

$\frac{0.24 mol}{1.20 L}$

= 0.2 M

Therefore, calculate pH upon addition of 0.02 mol of HI as follows.

pH = $pK_{a} + log(\frac{[salt]}{[acid]})$

= $4.87 + log \frac{0.2}{0.175}$

= 4.87 + log (0.114)

= 4.98

Hence, the pH of the buffer after the addition of 0.02 mol of HI is 4.98.

7 0

3 years ago

How many grams of ethyl alcohol (C2H5OH) are in a 1500 ml solution which is 1.54M?

Sedbober [7]

Answer:

The answer is 1.54molar mass.

7 0

3 years ago

Read 2 more answers

put the ions in order from the ion with the fewest oxygen atoms to the ion with the most oxygen atoms.

dezoksy [38]

Answer:

Chloride , hypochlorite, chlorite , chlorate, perchlorate

Chloride ion Cl-

Perchlorate ClO4-

Chlorate ClO3-

Chlorite ClO2-

Hypochlorite ClO-

Explanation:

7 0

2 years ago

Calculate the number of moles 3.16 g of KMnO4 32.33 g of K2CrO4 100 g of KHCO3

kvasek [131]

The number of moles:
3.16g of $KMnO_{4}$
1 mole of $KMnO_{4}$ - 158g.
x moles of $KMnO_{4}$ - 3.16g.
$x=\frac{1\ mole*3.16g}{158g}=\frac{3.16}{158}=0.02\ mole$

The number of moles:
32.33g of $K_{2}CrO_{4}$
1 mole of $K_{2}CrO_{4}$ - 194g.
x moles of $K_{2}CrO_{4}$ - 32.33g.
$x=\frac{1\ mole*32.33g}{194g}=\frac{32.33}{194}=0.17\ mole$

The number of moles:
100g of $KHCO_{3}$
1 mole of $KHCO_{3}$ - 100.1g.
x moles of $KHCO_{3}$ - 100g.
$x=\frac{1\ mole*100g}{100.1g}=\frac{100}{100.1}=0.999\ mole$

Greetings,
n00nst00p :)

3 0

3 years ago

Question 24 Multiple Choice Worth 2 points) [BWS.02] Why is science important for society?

gulaghasi [49]

Answer:

Because the scientific knowledge itself helps solve many basic human needs and it also improves how humans live and their standards. For example, without science medications wouldn´t exist and many technological devices we use now-a-days. We´re surrounded by science, we just don´t really notice it.

3 0

3 years ago