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Keith_Richards [23]
3 years ago
6

To indicate the pH of a substance, one can use a dye that is both an acid and that appears as different colors in its protonated

and deprotonated forms. Suppose that you have a 0.001 M solution of a dye with a pKa of 7.2. From the color, the concentration of the protonated form, HA, is 0.0002 M. Assume that the remainder of the dye is in the deprotonated form, A−. What is the pH of the solution? Give your answer to one decimal place. g
Chemistry
1 answer:
PIT_PIT [208]3 years ago
3 0

Answer:

<em>The pH of the solution is 7.8</em>

Explanation:

The concentration of the solution is 0.001M and  the dye could be in its protonated and deprotonated forms. If the concentration of the protonated form [HA] is 0.0002 M the concentration of the deprotonated form will be the subtraction between the concentration of the bye and the concentration of the protonated form:

[A-] = 0.001M - 0.0002M = 0.0008M

Also, the Henderson-Hasselbalch equation is

pH = pKa + Log \frac{[A^{-}]}{[HA]}

this equation shows the dependency between the pH of the solution, the pKa and the concentration of the protonated and deprotonated forms. Thus, replacing in the equation

pH = 7.2 + Log \frac{0.0008M}{0.0002M} = 7.8

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7 0
3 years ago
How many pounds of ice are required to absorb 4900 kJ of heat as the ice melts? The heat of fusion of water is 0.334 kJ/g.
Goshia [24]

Answer:

m = 32.34 pounds of ice.

Explanation:

In this case we need to use the following expression of heat:

q = m * ΔHf   (1)

Where:

q: heat absorbed in J or kJ

m: mass of the compound in g

ΔHf: heat of fusion of the water in kJ/g

We are asked to look for the mass of ice in pounds, so after we get the grams, we need to convert the grams to pounds, using the following conversion:

1 pound --------> 453.59 g   (2)

So, we have the heat and heat of fusion, from (1) let's solve for the mass, and then, using (2) the conversion to pounds:

q = m * ΔHf  

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m = 14,670.66 g * 1 pound/453.59 g

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Hope this helps  

5 0
3 years ago
Under which conditions are gases most soluble in water?
Volgvan

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6 0
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How many moles of CO2 are emitted into the atmosphere when 22.1 g C8H18 is burned
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Next, let us calculate the number of mole of C8H18 present in 22.1g of C8H18. This is illustrated below:

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From the balanced equation above,

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