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2 years ago

An elementary step is characterized by its _____, which is equal to the number of reactant particles in the step.

Chemistry

1 answer:

Troyanec [42]2 years ago

4 0

Answer:

An elementary step is characterized by its molecularity_____, which is equal to the number roof reactant particles in the step.

Explanation:

because you add the elements toghether

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Calculate the pH of a solution prepared by dissolving 0.370 mol of formic acid (HCO2H) and 0.230 mol of sodium formate (NaCO2H)

Veronika [31]

The question is incomplete, here is the complete question:

Calculate the pH of a solution prepared by dissolving 0.370 mol of formic acid (HCO₂H) and 0.230 mol of sodium formate (NaCO₂H) in water sufficient to yield 1.00 L of solution. The Ka of formic acid is 1.77 × 10⁻⁴

a) 2.099

b) 10.463

c) 3.546

d) 2.307

e) 3.952

Answer: The pH of the solution is 3.546

Explanation:

We are given:

Moles of formic acid = 0.370 moles

Moles of sodium formate = 0.230 moles

Volume of solution = 1 L

To calculate the molarity of solution, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$

To calculate the pH of acidic buffer, we use the equation given by Henderson Hasselbalch:

$pH=pK_a+\log(\frac{[salt]}{[acid]})$

$pH=pK_a+\log(\frac{[HCOONa]}{[HCOOH]})$

$pK_a$ = negative logarithm of acid dissociation constant of formic acid = 3.75

$[HCOONa]=\frac{0.230}{1}$

$[HCOOH]=\frac{0.370}{1}$

pH = ?

Putting values in above equation, we get:

$pH=3.75+\log(\frac{0.23/1}{0.37/1})\\\\pH=3.54$

Hence, the pH of the solution is 3.546

5 0

3 years ago

Anthracite is so hard and pure it is also referred to as a _____.

Serga [27]

Anthracite is also referred to as hard coal because it is so hard and pure. It is very hard and highly compacted with variety of coal that has submetallic luster. It has highest carbon content, the lowest impurities, and highest density of energy of all the coal deposits.

6 0

3 years ago

Is waste water a pure subtance or a mixture

Alla [95]

The pure substance of water mixes with the waste. The waste does not dissolve into the water, therefore it is a mixture.

6 0

3 years ago

What is the final concentration when 5 ml of a 2.5M copper sulphate solution is diluted to 750 ml?

Firdavs [7]

Answer: The final concentration when 5 ml of a 2.5M copper sulphate solution is diluted to 750 ml is 0.017 M

Explanation:

According to the dilution law,

$M_1V_1=M_2V_2$

where,

$M_1$ = molarity of stock $CuSO_4$ solution = 2.5 M

$V_1$ = volume of stock $CuSO_4$ solution = 5 ml

$M_1$ = molarity of diluted $CuSO_4$ solution = ?

$V_1$ = volume of diluted $CuSO_4$ solution = 750 ml

Putting in the values we get:

$2.5\times 5=M_2\times 750$

$M_2=0.017$

Therefore the final concentration when 5 ml of a 2.5M copper sulphate solution is diluted to 750 ml is 0.017 M

6 0

3 years ago

What do you expect will occur as air masses move over cold locations? Hot locations? How does this movement of air masses affect

Maksim231197 [3]

Answer:

Explanation:

When air masses will move over cold location then bottom layer of air cools and become more dense. Due to its high density it is trapped near the ground then it flow towards the equator.

When it moves over hot location then bottom layer gets hot and lighter. Then it moves towards poles.

It changes the temperature and humidity of the climate. making hoter region coll and cooler region a bit hot.

3 0

3 years ago