This is a classic acid/base chemistry question. First let's find the total number of moles of protons and hydroxide ions that will be present in the reaction. First, we multiply the molarity of HNO3 (nitric acid) by the volume:
(0.0125 moles / L) * 0.075 L = 0.0009375 moles of H+
Now let's do the same thing to find the moles of hydroxide (OH-) present. Each mole of Be(OH)2 will produce 2 moles of OH- so we need to multiply by 2:
(0.0240 moles / L) * 0.130 L * 2 = 0.00624 moles of OH-
Since the H+ will react with OH- to produce H2O, we need to see which species in present in a greater amount. There are more moles of hydroxide present than protons, so we can subtract the numbers to find out what the excess amount of hydroxide remaining is:
0.00624 - 0.0009375 = 0.0053025 moles of OH- remaining.
We can divide the moles of hydroxide by the total volume of solution present to find the concentration of hydroxide. The total volume of the solution is 130 mL + 75 mL = 205 mL
0.0053025 moles / 205 mL = 0.0259 M
We can convert the molarity of hydroxide ions into a pOH value by taking the negative log of the concentration via the equation below:
pOH = -log[OH-] = -log(0.0259) = 1.59
Since pH + pOH = 14, that means that we subtract the pOH from 14 to find the pH:
pH = 14 - pOH = 14 - 1.59 = 12.41
So the pH of the solution is 12.41. The amount of a 0.075 M solution of HCl needed to add to neutralize the hydroxide is calculated below:
0.0053025 moles * (1 L / 0.075 moles) = 0.0707 L = 70.7 mL
So 70.7 mL of HCl solution would be required to neutralize the resulting solution.
Friday, September 20, 2019
75 ml of a solution of HNO3 (0.0125 M) are added to 130 ml of a solution of Be(OH)2 (0.0240 M). Calculate the ph of the final solution and the volume of HCl or Mg(OH)2 to add to neutralize the obtained (final) solution. The concentration of the acid or base for the neutralization is 0.075.
Subscribe to:
Post Comments (Atom)
Why is the fact that the Americans are helping the Russians important?
In the late author Tom Clancy’s first novel, The Hunt for Red October, the assistance rendered to the Russians by the United States is impor...
-
There are a plethora of rules that Jonas and the other citizens must follow. Again, page numbers will vary given the edition of the book tha...
-
The only example of simile in "The Lottery"—and a particularly weak one at that—is when Mrs. Hutchinson taps Mrs. Delacroix on the...
-
A good thesis statement presents a claim (an interpretive stance on a story that can be defended using textual evidence) and is a position w...
-
The given two points of the exponential function are (2,24) and (3,144). To determine the exponential function y=ab^x plug-in the given x an...
-
What does the hot air balloon symbolize? To the Assad son who buys the hot air balloon, it symbolizes a kind of whimsy that he can afford. B...
-
The play Duchess of Malfi is named after the character and real life historical tragic figure of Duchess of Malfi who was the regent of the ...
-
Allie’s baseball mitt is extremely important to Holden in The Catcher in the Rye. It is a symbol of Allie since it was important to his brot...
No comments:
Post a Comment