How much of your blood is made of Plasma? A)10% <br> B)25% c)40% d)50%

The weak acid HA is 4 % ionized (dissociated) in a 0.30 M solution. A. What is Ka for this acid?B. What is the pH of this soluti

ANTONII [103]

Answer:

$Ka=5x10^{-4}$

$pH=1.92$

Explanation:

Hello,

In this case, given the percent ionization and the concentration of the acid, one computes the concentration of hydrogen ions as follows:

$\% ionization=\frac{[H^+]}{[HA]}*100\%$

$[H^+]=\frac{\% ionization*[HA]}{100\%} =\frac{4\%*0.30M}{100\%}=0.012M$

Therefore the Ka is computed by using the equilibrium expression:

$Ka=\frac{[H^+][A^-]}{[HA]} =\frac{0.012M*0.012M}{0.30M-0.012M}\\ \\Ka=5x10^{-4}$

And the pH:

$pH=-log([H^+])=-log(0.012)\\\\pH=1.92$

Regards.

4 0

3 years ago

Each side of a square is 8 by 10 metre find the area of the square

kolbaska11 [484]

Answer and Explanation:

I believe the answer is 8

7 0

3 years ago

Read 2 more answers

A solution of aminoheptanoic acid, H2N-(CH2).COOH, in m-cresol at a concentration of 3.3 mol amino acid per kg of solution is po

garik1379 [7]

Explanation:

The given data is as follows.

Concentration = 3.3 mol

Rate constant = $2.74 \times 10^{3} kg/mol min$

Molecular weight = 55000 g/mol

$\tau = C_{A_{0}} \times \int_{0}^{X_{A}} \frac{dX_{A}}{-r_{A}}$

Initial concentration ( $C_{A_{0}}$ ) of aminoheptanoic is 3.3 kg/mol.

$-r_{A} = 2.74 \times 10^{3} kg/mol min$

Hence, putting the given values into the above formula as follows.

$\tau = C_{A_{0}}\times \int_{0}^{X_{A}} \frac{dX_{A}}{-r_{A}}$

= $\frac{3.3}{2.74 \times 10^{3} kg/mol min} [X_{A}]^{0.1}_{0}$

= 120.43 min

Thus, we can conclude that total time required to to form polyamide is 120.43 min.

3 0

3 years ago

Identify the following changes as physical or chemical. A loaf of risen but unbaked bread. Photo by Elinor D Bread dough rising:

sergey [27]

The answers include:

A loaf of risen but unbaked bread - chemical change.
Photo by Elinor D - chemical change.
Bread dough rising - chemical change.

<h3>What is a Chemical change?</h3>

This involves the formation of a new products from substances. In this scenario, a rising bread contains alcohol which evaporates.

Photographs also fall under this category and is therefore an irreversible chemical change.

Read more about Chemical change here

brainly.com/question/1222323

#SPJ1

4 0

2 years ago

There are more electrons than protons in a negatively charged atom. (2 points) True False

Mkey [24]

Answer:

it's false i think

Explanation:

5 0

3 years ago

Read 2 more answers

How much of your blood is made of Plasma? A)10% B)25% c)40% d)50%