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3 years ago

Explain how a Buffer acts to resist pH change in a system upon addition of an acid or a base

Chemistry

1 answer:

Leokris [45]3 years ago

4 0

Answer:

Explanation has been given below.

Explanation:

A buffer consists of either of a weak acid along with it's conjugate base or a weak base along with it's conjugate acid.
Let's consider a buffer consists of a weak acid along with it's conjugate base
If we add an acid to this buffer then conjugate base gets protonated and converted to corresponding weak acid. So effect of addition of acid gets neutralized by forming weak acid rather than increase in concentration of proton in solution.
If we add a base to this buffer then weak acid gets converted to corresponding conjugate base. So effect of addition of base gets neutralized by forming conjugate base rather than in crease in concentration of hydroxyl ion in solution.

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When heat is applied to 80 grams of CaCO3, it yields 39 grams of B. Determine the percentage of the yield.

EleoNora [17]

The question is incomplete, the complete question is:

When heat is applied to 80 grams of CaCO3, it yields 39 grams of CaO Determine the percentage of the yield.

CaCO3→CaO + CO2

Answer: The % yield of the product is 87.05 %

Explanation:

The number of moles is defined as the ratio of the mass of a substance to its molar mass.

The equation used is:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ ......(1)

We are given:

Given mass of $CaCO_3$ = 80 g

Molar mass of $CaCO_3$ = 100 g/mol

Putting values in equation 1, we get:

$\text{Moles of }CaCO_3=\frac{80g}{100g/mol}=0.8mol$

For the given chemical reaction:

$CaCO_3\rightarrow CaO+CO_2$

By stoichiometry of the reaction:

If 1 mole of $CaCO_3$ produces 1 mole of CaO

So, 0.8 moles of $CaCO_3$ will produce = $\frac{1}{1}\times 0.8=0.8mol$ of CaO

We know, molar mass of $CaO$ = 56 g/mol

Putting values in above equation, we get:

$\text{Mass of CaO}=(0.8mol\times 56g/mol)=44.8g$

The percent yield of a reaction is calculated by using an equation:

$\% \text{yield}=\frac{\text{Actual value}}{\text{Theoretical value}}\times 100$ ......(2)

Given values:

Actual value of the product = 39 g

Theoretical value of the product = 44.8 g

Plugging values in equation 2:

$\% \text{yield}=\frac{39 g}{44.8g}\times 100\\\\\% \text{yield}=87.05\%$

Hence, the % yield of the product is 87.05 %

6 0

3 years ago

if you were one of the immigrants, would you willingly submit to have yourself undergone x-ray to prove yourself being a minor?

MariettaO [177]

Answer:

I'm pretty sure this is a question about your opinion so there is no wrong answer! Just think about the question and if you were in those shoes. There is no right or wrong answer! :)

Explanation:

3 0

3 years ago

Which of the following is an exothermic reaction?

agasfer [191]

The answer is B) an explosion

An exothermic reaction is a chemical reaction that is caused by heat and light.

Have a good day! =)

6 0

4 years ago

What units do chemists normally use for the density of liquids and solids? For the density of gas? Explain the differences.

beks73 [17]

Answer:

Densities of the solids and the liquids are expressed in units of grams per cubic centimeter (g/cm³) or in grams per milliliter (g/mL).

Densities of the gases are usually expressed in the units of grams per liter (g/L).

Explanation:

Density of a substance can be defined as the ratio of its mass and its volume.

The constituting atoms in the solids and liquids are fairly packed closely together.

In general, a 1 cm³ or 1 mL volume of most of the solids and the liquids has mass of several grams. Thus, densities of the solids and the liquids are expressed in units of grams per cubic centimeter (g/cm³) or in grams per milliliter (g/mL).

The constituent atoms or the molecules in the gases are far apart from each other when compared to the solids and the liquids.

Thus, gases are much less dense and even about 1 L of gas have mass in range close to 1 gram. Thus, densities of the gases are usually expressed in the units of grams per liter (g/L).

Also, the density of the gases also depend upon the pressure and the temperature but these factors much not influence the density of the solids and the gases.

7 0

4 years ago

1.) How do plant scientists hope to improve plant processes?

NISA [10]

Question:

1.) How do plant scientists hope to improve plant processes?

Answer:

January 2, 2012. Plant scientists long have known they can alter crops genetically to improve performance; they've been doing it thousands of years.

Question:

2.) How could you find out which resources are the most important for a plant to grow?

Answer:

Three elements, carbon, oxygen and hydrogen, are essential to plant growth and are supplied by air and water.

Hope it helps (^^)

# Cary on learning

6 0

3 years ago

Read 2 more answers