4 years ago

Which of the following statements are true regarding SDSs and labels?(OSHA)

1 answer:

8 0

Answer:

particles larger than 5 microns are normally expelled. -particles smaller than 5 microns may enter into alveolar sacs. ... -chemical can penetrate skin and go into bloodstream.

Explanation:

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Calculate the pH for the following weak acid. A solution of HCOOH has 0.12M HCOOH at equilibrium. The Ka for HCOOH is 1.8×10−4.

Shtirlitz [24]

Answer:

the pH of HCOOH solution is 2.33

Explanation:

The ionization equation for the given acid is written as:

$HCOOH\leftrightarrow H^++HCOO^-$

Let's say the initial concentration of the acid is c and the change in concentration x.

Then, equilibrium concentration of acid = (c-x)

and the equilibrium concentration for each of the product would be x

Equilibrium expression for the above equation would be:

$\Ka= \frac{[H^+][HCOO^-]}{[HCOOH]}$

$1.8*10^-^4=\frac{x^2}{c-x}$

From given info, equilibrium concentration of the acid is 0.12

So, (c-x) = 0.12

hence,

$1.8*10^-^4=\frac{x^2}{0.12}$

Let's solve this for x. Multiply both sides by 0.12

$2.16*10^-^5=x^2$

taking square root to both sides:

$x=0.00465$

Now, we have got the concentration of $[H^+] .$

$[H^+] = 0.00465 M$

We know that, $pH=-log[H^+]$

pH = -log(0.00465)

pH = 2.33

Hence, the pH of HCOOH solution is 2.33.

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3 years ago

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True or false atoms are made up of tiny particles called molecules true or false

Nana76 [90]

False, Molecules are made of atoms and atoms are made of quarks.

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3 years ago

How many seconds in the school year? (One school year is 180 days long.) Please show your work, and report your answer with the

Masja [62]

Answer:

259200

Explanation:

multiply 180×24×60

259,200 seconds

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3 years ago

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Which solid is crumbly, weak, red-brown and in the periodic table (It's probably a metal)

slega [8]

I think is nitrogen!!!

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3 years ago

What is the half-life of a radioisotope if 25.0 grams of an original 200.-gram sample of the isotope remains unchanged after 11.

erastova [34]

1. 200/2=100. 100/2=50. 50/2=25. So that's 3 to get to 25.

2. 11.46/3=3.82

The answer is (2).

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3 years ago

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