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3 years ago

151200 as scientific notation

1 answer:

5 0

1.512 x 10^5

You simply move the decimal point to the left until you get a number greater than or equal to one, and less than 10, then take that number, and the number of decimal places you moved is the exponent.

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Whats the strongest base on the ph scale? A.HCI B.NaOH C.blood D.saliva

Zepler [3.9K]

Answer:

NaOH

Explanation:

The sodium hydroxide is strongest base because it fully dissociate into ions.

It dissociate to gives the sodium and hydroxyl ions and solution became more basic.

NaOH → Na⁺(aq) + OH⁻(aq)

Its pH is 12. It is also known as caustic soda.

Other given Options:

The pH of blood is vary from 7.35 - 7.45. it is slightly alkaline.

The pH of HCl is 3.

The pH of saliva is 6.2 - 7.6.

We know that neutral pH is 7 the pH less than 7 is acidic so HCl is acidic because its pH is 3.

The pH is greater then 7 is basic so saliva and blood are basic but less than the NaOH.

3 0

3 years ago

What assumption did you make about the reaction of kmno4 solution and h2c2o4 solution in those determinations that allowed you t

a_sh-v [17]

Check the attachment out.. I think thats what you looking for. I hope it helped. :)

8 0

3 years ago

On which body in the Solar system would some life forms from Earth be most likely to survive?

Anon25 [30]

Answer: I would think Europa.

Explanation:

4 0

2 years ago

Read 2 more answers

As a technician in a large pharmaceutical research firm, you need to produce 250. mL of a potassium dihydrogen phosphate buffer

Reika [66]

Answer:

We will need 147.772 mL of KH2PO4 to make this solution

Explanation:

For this case we can give the following equation:

H2PO4 - ⇄ H+ + HPO42-

With following pH- equation:

pH = pKa + log [HPO42-]/[H2PO4-]

7.05 = 7.21 + log [HPO42-]/[H2PO4-]

-0.16 = log [HPO42-]/[H2PO4-]

10^-0.16 = [HPO42-]/[H2PO4-]

0.6918 = [HPO42-]/[H2PO4-]

Let's say the volume of HPO42-= x then the volume of H2PO4- will be 250 mL - x

Since both have a concentration of 1M = 1 mol /L

If we plug this in the equation 0.6918 = [HPO42-]/[H2PO4-]

0.6918 = x / (250 - x)

0.6918*250 - 0.6918x = x

172.95 = 1.6918x

x = 102.228 mL

The volume of HPO42- = 102.228 mL

Then the volume of H2PO4- = 250 - 102.228 = 147.772 mL

To control this we can plug this in the pH equation

7.05 = 7.21 + log [HPO42-]/[H2PO4-]

7.05= 7.21 + log (102.228 / 147.772) = 7.05

We will need 147.772 mL of KH2PO4 to make this solution

3 0

3 years ago

Describe the whole process of Aluminum extraction from bauxite.

AlekseyPX

Answer:

Extraction of aluminium

Aluminium ore is called bauxite . The bauxite is purified to produce aluminium oxide, a white powder from which aluminium can be extracted. The extraction is done by electrolysis. The ions in the aluminium oxide must be free to move so that electricity can pass through it.

4 0

2 years ago

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