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3 years ago

Reagent needed to convert sulphur dioxide to Sulphur

1 answer:

5 0

<span>6 + x = 12. To evaluate an algebraic expression, you have to substitute a number for each variable and perform the arithmetic operations. In the example above, the variable x is equal to 6 since 6 + 6 = 12. If we know the value of our variables, we can replace the variables with their values and then evaluate the expression.</span>

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A solution is made by mixing 0.82 grams of sodium acetate, 1 mL of 12 M acetic acid (pKa=4.76) and water to give a final volume

kompoz [17]

Answer:

This solution acts as an efficient buffer

Explanation:

the pH of a buffer solution can be described like this: $pH=pKa+log\frac{[base]}{[acid]}$

[acid]=[acetic acid]= $1mL.\frac{12mol}{1000mL} . \frac{1}{1L} = 0.012M$

[base]=[sodium acetate]= $0.82g.\frac{1mol}{82g} .\frac{1}{1l} = 0.01M$

replacing, $pH=4.76+log\frac{0.01M}{0.012M} =4.84$

If we add an acid, pH will decrease a little bit and if we add a base, pH wil increase a little bit.

lets supose that we change the rate by increasing [base] to 0.1, then

$pH=4,76+log\frac{0.1}{0.012} = 5.68$

and now lets supose that we increase [acid] to 0.1 $pH=4.76+log\frac{0.01}{0.1} = 3.76$

Big changes in concentration of base or acid doesn´t produce big changes in pH, in that way the mix of sodium acetate with acetic acid is a good buffer solution.

4 0

2 years ago

The ease with which a raw material can be molded , flattened , or bent is known as its ?

Leya [2.2K]

A. Malleability

Ductility is being able to be drawn into wires
Elasticity is being able to resist stress
Resilience is being able to spring back into shape (kind of like elasticity)

6 0

3 years ago

Read 2 more answers

1. A dining hall had a total of 25 tables-some long rectangular tables and some round

TEA [102]

x = 20 long tables

y = 5 round table

Explanation:

We have the following system of equations:

x + y = 25

8x + 6y = 190

From the first equation we have:

x = 25 - y

And we replace x in the second equation:

8(25 - y) + 6y = 190

200 - 8y + 6y = 190

200 - 2y = 190

200 - 190 = 2y

10 = 2y

y = 5

Now we insert the value of y in the next equation:

x = 25 - y

x = 25 - 5

x = 20

Learn more about:

system of equations

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7 0

3 years ago

What would you observe in the reaction of calcium with nitric acid

Marina CMI [18]

Answer:

reacts to form carbondioxide

6 0

3 years ago

For the reaction H2PO4- HAsO4 2-HPO4 2-+H2AsO4- <br> what species are a conjugate acid-base pair?

aleksklad [387]

Ionic equation:

$\text{H}_2\text{PO}_4^{-} + \text{HAsO}_4^{2-} \to \text{HPO}_4^{2-} + \text{H}_2\text{AsO}_4^{-}$

The acid and base in a conjugate pair differ by only one proton $\text{H}^{+}$ . The acid loses one proton to produce a conjugate base, whereas the base gains a proton to produce its conjugate acid.

$\text{H}_2\text{PO}_4^{-}$ loses one proton to produce $\text{HPO}_4^{2-}$ in this reaction.

$\text{H}_2\text{PO}_4^{-} \to \text{H}^{+} + \text{HPO}_4^{2-}$

Meanwhile, $\text{HAsO}_4^{2-}$ gains one proton to form $\text{H}_2\text{AsO}_4^{-}$ .

$\text{HAsO}_4^{2-} + \text{H}^{+} \to \text{H}_2\text{AsO}_4^{-}$

Therefore

$\text{H}_2\text{PO}_4^{-}$ is the conjugate acid $\text{HPO}_4^{2-}$ , its conjugate base.
$\text{HAsO}_4^{2-}$ is the conjugate base of $\text{H}_2\text{AsO}_4^{-}$ , its conjugate acid.

8 0

3 years ago

Read 2 more answers