Question

A beaker contains 100 mL of NaOH solution at pH = 13. A technician carefully pours into the beaker 10 mL of HCl at pH = 1. Which of the following statements correctly describes the results of this mixing? a. The concentration of Na⁺ ion rises. b. The concentration of Cl⁻ ion will be 0.1 M. c. The concentration of undissociated H₂O molecules remains unchanged. d. The pH of the beaker's contents will be neutral. e. The pH of the beaker's contents falls.

          A beaker contains 100 mL of NaOH solution at pH = 13. A technician carefully pours into the beaker 10 mL of HCl at pH = 1. Which of the following statements correctly describes the results of this mixing?
a. The concentration of Na⁺ ion rises.
b. The concentration of Cl⁻ ion will be 0.1 M.
c. The concentration of undissociated H₂O molecules remains unchanged.
d. The pH of the beaker's contents will be neutral.
e. The pH of the beaker's contents falls.

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Added by Kevin C.

Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

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Solved by Expert Jennifer Hudspeth

09/07/2022

Step 1

Given that the pH of the NaOH solution is 13, we can find the pOH: \[ \text{pOH} = 14 - \text{pH} = 14 - 13 = 1 \] Show more…

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A beaker contains 100 mL of NaOH solution at pH = 13. A technician carefully pours into the beaker 10 mL of HCl at pH = 1. Which of the following statements correctly describes the results of this mixing? a. The concentration of Na⁺ ion rises. b. The concentration of Cl⁻ ion will be 0.1 M. c. The concentration of undissociated H₂O molecules remains unchanged. d. The pH of the beaker's contents will be neutral. e. The pH of the beaker's contents falls.

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Transcript

00:02 Hi there.

00:03 In this question, we have a beaker, and our beaker contains 100 milliliters of a sodium hydroxide solution.

00:28 All right.

00:35 Well, sodium hydroxide, when it dissociates, it dissociates into sodium ions and hydroxide ions, which means, according to arrhenius ' definition, anything that produces hydroxide ions in water, is a base.

00:54 So this is a base, and as we would expect from a base, it has a ph of 13.

01:04 Remember on the ph scale, let's do a little ph scale here.

01:12 Ph scale ranges from 0 to 14.

01:19 7 on the ph scale is neutral.

01:25 A ph between 7 and 14 would be a base, while a ph between 0 and 7 would be an acid.

01:34 Okay, so 2.

01:36 So adding to this beaker, we are going to add 10 milliliters of hcl.

01:47 So hcl produces hydrogen ions in water and chloride ions.

01:57 But since it produces hydrogen ions, it means it is an acid.

02:04 And agreeing with that, we see that it has a ph that equals 1.

02:10 All right, so we are adding this to this beaker.

02:16 So that means that we now have a total volume in here of 110 milliliters.

02:25 Because we took 100 and added 10 more.

02:28 All right, and we want to know which of our answer options are true.

02:34 And we have five answer options to consider.

02:39 Let's look at our first one.

02:40 First one says the concentration of n8 plus ions rises.

02:45 Well, that's not true.

02:46 We're adding more volume.

02:47 And the volume we're adding does not have n .a...

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