1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
faust18 [17]
3 years ago
13

The maximum allowable concentration of Pb2+ ions in drinking water is 0.05 ppm (i.e., 0.05 g of Pb2+ in 1 million grams of water

). (a) What is the Pb2+ concentration of an underground water supply at equilibrium with the mineral cerussite (PbCO3) (Ksp = 3.3 × 10−14) ? × 10 g / LEnter your answer in scientific notation. (b) Does this concentration exceed the allowable concentration guideline? Yes No
Chemistry
1 answer:
Diano4ka-milaya [45]3 years ago
6 0

Answer:

a. 0,049g of Pb²⁺ in 1 million grams of water.

b. No

Explanation:

The equilibrium of PbCO₃ in water is:

PbCO₃ ⇄ Pb²⁺ + CO₃²⁻

Where ksp is defined as:

ksp = [Pb²⁺] [CO₃²⁻] <em>(1)</em>

The initial concentration of PbCO₃ in molarity is:

\frac{10g}{1L}×\frac{1mol}{267,21g}= 0,0374M

a. The concentrations in equilibrium are:

[PbCO₃} = 0,0374M-x

[Pb²⁺] = x

[CO₃²⁻] = x

Replacing in (1)

3,3x10⁻¹⁴ = x²

x = 1,82x10⁻⁷M

Thus, [Pb²⁺] = 1,82x10⁻⁷M, this value in g of Pb²⁺ per million grams of water is:

1,82x10⁻⁷M×\frac{267,21g}{1mol}×\frac{1x10^6g}{1000g} = <em>0,049 g of Pb²⁺ in 1 million grams of water</em>

As this value is lower than the maximum allowable concentration of Pb²⁺, <em>the concentration doesn't exceed this maximum value</em>

<em />

I hope it helps!

You might be interested in
Amobarbital sodium react with ethanolic sodium hyrooxide
CaHeK987 [17]

Amobarbital (like all barbiturates) works by being incontestible to the GABAA receptor at either the alpha or the beta subunit.

<h3>What is the mechanism of amobarbital?</h3>

Amobarbital (like all barbiturates) works by binding to the GABAA receptor at either the alpha or the beta subunit. These are compulsory sites that are distinct from GABA itself and also distinct from the benzodiazepine binding site.

Amobarbital is a barbiturate classified as having a halfway duration of action, meaning that the effects of the drug can last from 4-6 amobarbital increases the effects of benazepril by apparatus: pharmacodynamic synergism.

So we can conclude that Amobarbital, 5-ethyl-5-isoamyl barbituric acid like all barbiturates.

Learn more about Amobarbital here: brainly.com/question/7237163

#SPJ1

6 0
2 years ago
Which functional group identifies a compound as an alcohol
creativ13 [48]

Answer:

-OH functional group

Trust me

8 0
3 years ago
Please help i am losing motivation and very depressed please look at photo and answer.
iris [78.8K]

Answer:

Solid turns to liquid.

Explanation:

When you freeze water, it turns into ice. When melted it's still water. No chemical changes were made to the piece of ice melted. The only change was ice (solid) to water (liquid)

Conservation of Matter - Matter can change forms through physical and chemical changes, but no matter what, matter is conserved. The same amount of matter exists before and after the change.

<em><u>Hope this helps! Please mark brainliest!</u></em>

5 0
3 years ago
A group of scientists in Alaska notices that not only have atmospheric CO2 levels increased at their sampling site but so too ha
lutik1710 [3]

Answer:

The release of methane from thawed permafrost.

Explanation:

The complete question is

A group of scientists in Alaska notices that not only have atmospheric CO2 levels increased at their sampling site but so too have methane levels. What could account for this increase in methane levels?

- None of the answer options is correct.

- The release of methane from thawed permafrost.

-A decrease in beef production near the researchers' sampling area.

-The melting of permafrost accompanied by the thawing of methane-producing bacteria.

-The failure of rice paddies to be established in Alaska, given its climate.

Permafrost regions like the arctic circle hold a large supply supply of methane in their soils and their seas. Ordinarily, this methane should be gradually released naturally over a long period of time, but the effects of global warming is making these permafrost to thaw at a much faster rate, accelerating the release of methane into the atmosphere. The dark side is that methane is about 80 times more deadly when compared to CO2 in its contribution to the green house effect on earth.

5 0
4 years ago
If 335 g water at 35.5C loses 5750 J of heat, what is the final temperature of the water?
White raven [17]

Answer:

The final temperature is  39.58 degree Celsius

Explanation:

As we know

Q = m * c * change in temperature

Specific heat of water (c) = 4.2 joules per gram per Celsius degree

Substituting the given values we get  -

5750 = 335 * 4.2 * (X - 35.5)

X = 39.58 degree Celsius

3 0
3 years ago
Other questions:
  • In a motion diagram the size of the object must be less than the distance moved t or f
    11·2 answers
  • The empirical formula for a compound is CH2. Its molar mass is 140.1 g/mol. What is its molecular formula?
    12·2 answers
  • What is a molecule???
    14·1 answer
  • What is the calculated molar concentration of the Cl⁻ ions in 0.87 M MgCl2(aq)?
    14·1 answer
  • What is the accepted theory of permanence
    5·1 answer
  • What happens when you mix baking powder baking soda and hydrogen peroxide together?
    13·1 answer
  • How many atoms of he gas are present in a 450 ml container at 35°c and 740 mmhg?
    8·1 answer
  • What were the first 25 elements that found in the earth? <br><br>answer it plz. <br><br>​
    7·1 answer
  • Two waves travel through each other, and a crest forms with an amplitude smaller that either original waves. What has happened?
    12·1 answer
  • 1. What is the relationship between a DNA molecule, a gene and a protein?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!