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UkoKoshka [18]
3 years ago
5

The pH scale for acidity is defined by pH= -log subscript 10 [H superscript+] where [H superscript+] is the concentration of hyd

rogen ions measured in moles per liter (m).
A solution has a pH of 8.4
Calculate the concentration of hydrogen ions in moles per liter (M)
Mathematics
1 answer:
gtnhenbr [62]3 years ago
8 0

Answer:

The concentration of hydrogen ions in moles per liter (M) is 3.981 * 10^{-9}

Step-by-step explanation:

As we know

The hydrogen ion concentration of any solution at pH is given by

H^+ = 10^{-pH}

Substituting the given values in above equation, we get -

H^+ = 10^{-8.4}\\H^+ = 3.981 * 10^{-9} mol/l

The concentration of hydrogen ions in moles per liter (M) is 3.981 * 10^{-9}

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Which list of ordered pairs represents solutions to x + y = 2 ?
Sloan [31]
(-4, 6), (0, 2), (4, -2) are all ordered pairs that have the sum as 2.
-4+6 is the same thing as 6-4 if there's more positive than negative 
0+2=2 because 0 plus a number equals to that number
4-2=2 because you're adding a negative number with the positive number together to get the answer

Just be aware that I might not make any sense at all

3 0
3 years ago
Please help!!
ZanzabumX [31]

The two linear equations in two variable is:

12 x + 3 y = 40

7 x - 4 y = 38

(a) For a system of equations in two Variable

a x + by = c

p x + q y = r

It will have unique solution , when

\frac{a}{p}\neq \frac{b}{q}\neq\frac{c}{r}

As, you can see  that in the two equation Provided above

\frac{12}{7}\neq \frac{3}{-4}\neq \frac{40}{38}

So, we can say the system of equation given here has unique solution.

(b). If point (2.5, -3.4) satisfies both the equations, then it will be solution of the system of equation, otherwise not.

1. 12 x+3 y=40

2. 7 x-4 y=38

Substituting , x= 2.5 , and y= -3.4 in equation (1) and (2),

L.H.S of Equation (1)= 1 2 × 2.5 + 3 × (-3.4)

                             = 30 -10.20

                               = 19.80≠ R.H.S that is 40.

Similarly, L H S of equation (2)= 7 × (2.5) - 4 × (-3.4)

                                                  = 17.5 +13.6

                                                  = 31.1≠R HS that is 38

So, you can Write with 100 % confidence that point (2.5, -3.4) is not a solution of  this system of the equation.


5 0
2 years ago
PLEASE HELP!!! 50 POINTS AWARDED!!
sladkih [1.3K]

Answer:

answers below

Step-by-step explanation:

1. no

2. yes

3. no

4. yes

5. no

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8. no

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10. no

11. no

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5 0
3 years ago
Read 2 more answers
X-31=46 explain how u got it plz i need help
mrs_skeptik [129]

Answer:

x=77

Step-by-step explanation:

77-31=46

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2 years ago
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A bag contains 5 blue marbles and 8 orange marbles. Polly draws a marble from the bag and keeps the marble. Perry then draws a m
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5/39 is the answer ok yee yee
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