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Nonamiya [84]
3 years ago
6

The equation for the pH of a substance is pH = –log[H+], where H+ is the concentration of hydrogen ions. A basic solution has a

pH of 11.2. An acidic solution has a pH of 2.4. What is the approximate difference in the concentration of hydrogen ions between the two solutions?
Mathematics
2 answers:
Romashka-Z-Leto [24]3 years ago
8 0

Answer:

0.003981 . . . . moles per liter

Step-by-step explanation:

The concentration of H+ ions in the acid will be ...

10^(-2.4) ≈ 0.003981 . . . . moles per liter

The concentration of H+ ions in the base will be ...

10^-11.2 ≈ 0.000 000 000 006310 . . . . moles per liter

To a few decimal places, the difference is ...

0.003981 . . . . moles per liter

_____

The two numbers differ by about 9 orders of magnitude, so the value of the difference between the larger and the smaller is essentially the value of the larger number. The smaller one, by comparison, can be considered to be zero (for subtraction purposes).

hodyreva [135]3 years ago
3 0

Answer:

Answer:

0.003981 . . . . moles per liter

Step-by-step explanation:

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1 year ago
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Black_prince [1.1K]

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Y=2x+4

Step-by-step explanation:

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2 years ago
Find the least common denominator. <img src="https://tex.z-dn.net/?f=%5Cfrac%7B-7%7D%7B3y%7D%20%2C%20%5Cfrac%7B21%7D%7B7y%7D" id
Lina20 [59]

Answer:

21y

Step-by-step explanation:

Well, first take a look at what exactly an LCD is. You want the lowest common multiple of the denominators aka the bottoms of the fractions.

The two denominators you have are 3y and 7y. What multiplication or division can you do to make these two equal? Go through your multiples of 3 and 7 (think times tables) and see where they finally have one in common.

3, 6, 9, 12, 15, 18, 21, 24...

7, 14, 21, 28, 35...

So, between these two lists, we can see that the lowest multiple these two numbers have in common is 21. You could go higher and higher, but your question wants the lowest, so only 21 will do that for you. To make 3y and 7y equal, you need to multiply your first term by 7/7 and your second term by 3/3. If you do that, you'll see your least common denominator is 21y.

4 0
2 years ago
for a direct variation describe how the constant of variation affects whether y increases or decreases as x increases
xxMikexx [17]
Equation I 
<span>y=5/2x is indirect variation b'cos as the value of x increases, the value of y decreases and vice versa </span>

<span>let us substitue x=5, then we get </span>
<span>y=5/2(5) </span>
<span>y=1/2 ==> 0.5 </span>

<span>let us substitute x=10, we now get </span>
<span>y=5/2(10) => 1/4 => 0.25 </span>

<span>Equation II </span>
<span>y=x+4 </span>

<span>this is direct variation cos as you increase the value of x, the value of y wud also increase and vice versa </span>

<span>let us substitute different values for x </span>
<span>let x be 7 </span>
<span>y=7+4 </span>
<span>y = 11 </span>

<span>let x be 2 </span>
<span>y=2+4 </span>
<span>y=6 </span>

<span>thus this is direct variation </span>

<span>Equation III </span>
<span>y=4... this is neither cos there is no x..</span>
3 0
3 years ago
Four of the angles of a pentagon measure 85, 110, 135, and 95. Find the measure of the missing angle.
ratelena [41]
If you're using the app, try seeing this answer through your browser:  brainly.com/question/2763441

_______________


Sum of the angles of a n-sided polygon:

\mathsf{S_n=180^\circ\cdot (n-2)}


In this question, we have a pentagon, so

\mathsf{n=5,}


then

\mathsf{S_5=180^\circ\cdot (5-2)}\\\\ \mathsf{S_5=180^\circ\cdot 3}\\\\ \begin{array}{lcl}&#10;\!\!\!\mathsf{S_5=540^\circ}&\longleftarrow&\textsf{sum of the measures of the internal}\\&#10;&&\textsf{angles of a pentagon.}&#10;\end{array}


Let \mathsf{x} be the measure of the missing angle. So,

\mathsf{85^\circ+110^\circ+135^\circ+95^\circ+x=S_5}\\\\&#10;\mathsf{425^\circ+x=540^\circ}\\\\&#10;\mathsf{x=540^\circ-425^\circ}\\\\&#10;\mathsf{x=115^\circ}\quad\longleftarrow\quad\textsf{measure of the missing angle.}


I hope this helps. =)


Tags:  <em>sum internal angle missing pentagon polygon plane geometry</em>

4 0
2 years ago
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