PLEASE HELP ME!!! What is the answer to 6x^2-4x+10=0 using quadratic formula

Calculate the pH of a buffer solution made by mixing 300 mL of 0.2 M acetic acid, CH3COOH, and 200 mL of 0.3 M of its salt sodiu

Lesechka [4]

Answer:

Approximately $4.75$ .

Step-by-step explanation:

Remark: this approach make use of the fact that in the original solution, the concentration of $\rm CH_3COOH$ and $\rm CH_3COO^{-}$ are equal.

${\rm CH_3COOH} \rightleftharpoons {\rm CH_3COO^{-}} + {\rm H^{+}}$

Since $\rm CH_3COONa$ is a salt soluble in water. Once in water, it would readily ionize to give $\rm CH_3COO^{-}$ and $\rm Na^{+}$ ions.

Assume that the $\rm CH_3COOH$ and $\rm CH_3COO^{-}$ ions in this solution did not disintegrate at all. The solution would contain:

$0.3\; \rm L \times 0.2\; \rm mol \cdot L^{-1} = 0.06\; \rm mol$ of $\rm CH_3COOH$ , and

$0.06\; \rm mol$ of $\rm CH_3COO^{-}$ from $0.2\; \rm L \times 0.3\; \rm mol \cdot L^{-1} = 0.06\; \rm mol$ of $\rm CH_3COONa$ .

Accordingly, the concentration of $\rm CH_3COOH$ and $\rm CH_3COO^{-}$ would be:

$\begin{aligned} & c({\rm CH_3COOH}) \\ &= \frac{n({\rm CH_3COOH})}{V} \\ &= \frac{0.06\; \rm mol}{0.5\; \rm L} = 0.12\; \rm mol \cdot L^{-1} \end{aligned}$ .

$\begin{aligned} & c({\rm CH_3COO^{-}}) \\ &= \frac{n({\rm CH_3COO^{-}})}{V} \\ &= \frac{0.06\; \rm mol}{0.5\; \rm L} = 0.12\; \rm mol \cdot L^{-1} \end{aligned}$ .

In other words, in this buffer solution, the initial concentration of the weak acid $\rm CH_3COOH$ is the same as that of its conjugate base, $\rm CH_3COO^{-}$ .

Hence, once in equilibrium, the $\rm pH$ of this buffer solution would be the same as the ${\rm pK}_{a}$ of $\rm CH_3COOH$ .

Calculate the ${\rm pK}_{a}$ of $\rm CH_3COOH$ from its ${\rm K}_{a}$ :

$\begin{aligned} & {\rm pH}(\text{solution}) \\ &= {\rm pK}_{a} \\ &= -\log_{10}({\rm K}_{a}) \\ &= -\log_{10} (1.76 \times 10^{-5}) \\ &\approx 4.75\end{aligned}$ .

7 0

2 years ago

Based on information presented in the passage, which

Alborosie

According to the statement "Based on information presented in the passage, which best describes what Georgia was "tired of " (line 8)"

Being teased about Joseph Tank

The correct option is B.

<h3>Explanation:</h3>

According to this passage, Georgia was weary of being made fun of because of Joseph Tank, which was one of the main reasons she decided to wed him. We can infer from this that Georgia was generally fed up with being made fun of because of Joseph Tank.

<h3>What are comprehension passages?</h3>

Reading comprehension questions always have a high chance of being scored. A passage and some questions are given to us. Even if the information in the passage deviates from actual facts, it must be used to answer the questions.

<h3>What is a comprehension example?</h3>

The definition of comprehension refers to your conceptual or practical understanding of something. How well you comprehend a challenging math problem is an illustration of comprehension.

To know more about illustration of comprehension visit:

brainly.com/question/17057578

#SPJ4

5 0

1 year ago

WILL GIVE A LOT POINTS PLEASE HELP ASAP

Oksi-84 [34.3K]

Step-by-step explanation:

I think the answer is B why don't you use a calculator?

6 0

2 years ago

Read 2 more answers

4x-5,4(x-5),4(x+5) drag the phrases into each box to match each expression five sang the sum of four and number five more than t

jeyben [28]

Answer:

4x-5= 5 less than the product of 4 and a number. 4 (x-5)= The product of 4 and the difference of a number and 5. 4(x+5) = The product of 4 and the sum of a number and 5.

Step-by-step explanation:

I took the test online in K12 and when I reviewed it said that those are the correct answer.

8 0

3 years ago

What specific measure of a geometric figure is shown in the image?

Marysya12 [62]

Answer:

We need to see the image

Step-by-step explanation:

Show us the image so we can help you :)

5 0

1 year ago