Chemist might be ignorant about which problem related to hexavalent chromium ?

Determine the ph of an hf solution of each of the following concentrations.

Leokris [45]

The pH shows the degree of acidity of alkalinity of a solution. The pH of the HF can be obtained from the ICE table.

The term pH refers to the hydrogen ion concentration of a solution. Recall that acids produce hydrogen or oxonium ion in solution.

The first step to determine the pH of the HF solution is to set up the ICE table as shown;

HF + H2O ⇄ H3O^+ + F^-

I

C

E

The values of the initial concentration of HF as well as the Ka of HF are not given. If these two values are give, the pH can be obtained from;

Ka = [H3O^+] [ F^-]/[HF] Knowing that [H3O^+] = [ F^-] = x

Learn more about pH: brainly.com/question/22074421

6 0

2 years ago

Comparing and contrasting characters or even texts is not usually a good way to discuss the meaning or value of a work.

Mnenie [13.5K]

The statement about whether comparing and contrasting characters is not usually a good way to find the value of a work is:

False

<h3>Literary Analysis</h3>

This refers to the overall appraisal of a piece of literary work and this can be done through comparisons and contrasts.

With this in mind, this is one of the ways of making literary analysis, as it helps the researcher to find the differences which exists and by this, find the value of the text.

Therefore, the correct answer is false

Read more about comparison and contrast here:

brainly.com/question/20531480

6 0

2 years ago

what is the temperature of an 11.2-l sample of carbon monoxide, co, at 744 torr if it occupies 13.3 l at 55 °c and 744 torr?

Genrish500 [490]

The temperature of an 11.2 L sample of carbon monoxide, CO, at 744 torr is 276.21° K or 3.06° C

For given question,

A sample of carbon monoxide (CO) occupies 13.3 l at 55 °c and 744 torr

We know that Charles's Law consists of the relationship that exists between the volume and the temperature of a certain quantity of ideal gas.

This law says that when the amount of gas and pressure are constant, the quotient between the volume and the temperature will always have the same value:

V/T = k

Studying two different states, an initial state 1 and a final state 2, it is satisfied:

$\frac{V1}{T1} =\frac{V2}{T2}$

In this case, you can apply Charles's law because it can be seen that the pressure is constant, with a value of 744 torr at the beginning and end of the analysis. Then, you know:

V₁ = 11.2 L

T₁ = ?

V₂ = 13.3 L

T₂ = 55° C

= 328° K

Replacing in Charles's law:

$\frac{11.2}{T1} =\frac{13.3}{328}$

We solve above proportion to find the value of T1

⇒ 11.2 × 328 = T1 × 13.3

⇒ 3673.6 = T1 × 13.3

⇒ T1 = 276.21° K

⇒ T1 = 3.06° C

Therefore, the temperature of an 11.2 L sample of carbon monoxide, CO, at 744 torr is 276.21° K or 3.06° C

Learn more about the Charles's law here:

brainly.com/question/16927784

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8 0

2 years ago

The tip of a pinwheel is 0. 24 m from the center. The pinwheel spins 5 times each second. What is the tangential speed of the ti

balu736 [363]

When a body is moving in circular path at a
distance r from its center its velocity at any
instant will be directed tangentially. This is
what we call tangential velocity. It is
calculated as follows:
Vt=r(w)
where w = 5 rev/s (2m rad / rev) = 31.42
rad/s
Vt = 0.24(31.42) = 7.5 m/s

7 0

3 years ago

Which is equivalent to 80 superscript one-fourth x?.

Effectus [21]

Answer:

the second answer/option is right

7 0

3 years ago