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sleet_krkn [62]
3 years ago
13

Which combination of compounds will create a buffer solution? a weak acid and a weak base a weak acid and its conjugate base a s

trong acid and its conjugate base a strong acid and a strong base
Mathematics
2 answers:
Lemur [1.5K]3 years ago
4 0
Either a weak acid and its conjugate base, or a weak base and its conjugate acid.
Ostrovityanka [42]3 years ago
3 0

Answer:

a weak acid and its conjugate base    

Step-by-step explanation:

A Buffer solution is a solution that tends to keep the pH almost constant when small amounts of acids (H +) or  bases (OH-) are added, therefore, they are very useful to reduce the impact of drastic changes in (H+) and (OH-) in processes that require a specific pH. They can be prepared by dissolving in water adequate amounts of a weak acid and a salt of its conjugate base, or a weak base and a salt of its conjugate acid.

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The circumference of a circle is 140 cm.<br> What is the radius of the circle?
NikAS [45]

2*22/7*r=140

r=22.27

is the answer

8 0
3 years ago
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The circle graph shows how a family spends its annual income. If $37,800 is used for Housing and Clothing combined, what is the
astraxan [27]

Answer:

$90000

Step-by-step explanation:

From the pie chart,

Let the total annual income =  $y

The percentage of housing = 28 %

The percentage of clothing = 14 %

The combined percentage of housing and clothing = 28+14 = 42 %

If the amount spent on both housing and clothing combined = $ 37800

Therefore,

y(42/100) = 37800

Solve for y

42y = 37800×100

42y = 3780000

y = 3780000/42

y = $90000

Hence, the total annual income is $90000

4 0
3 years ago
A circle with the equation (x + 4)2 + (y - 3)2 = 9 is reflected over the line y = -1. What is the equation of the image?
Serggg [28]
The center of the given circle  = (-4, 3)
So the center of the image  = (-4, 3 -2(4)  =  (-4, -5)

So the equation of the image  is
(x + 4)^2 + (y + 5)^2 = 9

Its  choice 3.
5 0
4 years ago
Stephen opened a savings account with $100. He deposits $20 every time he mows a lawn during the summer. He wants at least $400
OverLord2011 [107]

Answer:

C. 100 + 20n > 400

Step-by-step explanation:

5 0
3 years ago
A soccer field is 100 Meyers wide and 230 meters long the coach asks players to run from one corner to the other corner diagonal
Kruka [31]

Hey!

Well a soccer field would be a rectangle and if cut across you will be presented with two right triangles. So since you are presented with right triangles you will need to know at least two sides to determine the third. The formula used for right triangles is...

a² + b² = c²

Now a and b are the "legs" of the triangle meaning the two sides that come together to make a 90° angle. The c in the equation would be the hypotenuse  of the triangle, otherwise the longest side or in this case the diagonal part. Now to find that distance you will have to plug in and solve...

100² + 230² = c²

10000 + 52900 = c²

62900 = c²

about 250.8 meters


Hope this Helped!

~A

4 0
3 years ago
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