All categories

4 years ago

Ph of 10 -4 M HCL solution

1 answer:

7 0

The HCl is a strong acid, that is, it is fully consumed in the reaction.

HCl(aq) ------------> H₃O⁺(aq) + Cl⁻(aq)
↓ ↓ ↓
10⁻⁴ M 0 0
-10⁻⁴ +10⁻⁴ +10⁻⁴
_____________________________________
0 + 10⁻⁴ M + 10⁻⁴ M

PH = - log [ H₃O⁺ ]

PH = - log [ 10⁻⁴]

PH = 4.0

You might be interested in

Silver has a density of 10.5g/cm to the 3rd and gold has density of 9.3g/cm to the 3rd. Which would have a greater mass, 5cm to

Akimi4 [234]

The density of gold is 19.3 g/cm³

Ag= silver
Au= gold.
density (Ag)=10.5 g/cm³.
density (Au)=19.3 g/cm³

We have to calculate the mass of 5 cm³ silver:

10.5 g---------------------1 cm³
x--------------------------- 5 cm³

x=(10.5 g * 5 cm³) / 1cm³ ≈52.5 g

And we have to calculate the mass of 5 g gold.

19.3 g------------------------1 cm³
x-------------------------------5 cm³

x=(19.3 g * 5 cm³) / 1cm³≈96.5 g

Then 5 cm³ silver are 52.5 g of mass, and 5 cm³ gold are 96.5 g of mass, therefore, gold would have a greater mass than silver.

answer:5 cm³ gold would have a greater mass than 5 cm³ silver.

3 0

4 years ago

Iron-59 which is used to diagnose anaemia has a half life of 45days, what fraction of it is left in 90 days

rodikova [14]

Answer:

0.25 of the original

Explanation:

(0.5)^(90/45)

7 0

3 years ago

Dolomite is a carbonate of magnesium and calcium. Analysis shows that 7.81 g of dolomite contains 1.70 grams of Ca. Fluorite is

andrew11 [14]

Answer:

The richer source of calcium is fluorite.

Explanation:

Percentage of element in compound :

$=\frac{\text{mass of element}}{\text{Mass of compound}}\times 100$

1. Dolomite is a carbonate of magnesium and calcium:

Given mass of dolomite = 7.81 g

Mass of calcium present in given mass of dolomite = 1.70 g

Percentage of calcium in Dolomite:

$=\frac{1.70 g}{7.81 g}\times 100=21.77\%$

2. Fluorite is a mineral of calcium and fluorine:

Given mass of fluorite = 2.76 g

Mass of fluorine present in given mass of fluorite = 1.34 g

Percentage of fluorine in fluorite :

$=\frac{1.34 g}{2.76 g}\times 100=48.55\%$

Percentage of calcium in fluorite = 100% - 48.55 % = 51.45%

Percentage of calcium in fluorite > Percentage of calcium in Dolomite

51.455 > 21.77%

So, the richer source of calcium is fluorite.

7 0

3 years ago

Which construction can you use to prove the Pythagorean Theorem based on similarity of triangles?

Vinvika [58]

To prove the Pythagorean Theorem based on similarity of triangles, you can always use the 2nd construction.

The 2nd construction is achieved by drawing a perpendicular line joining between the right angle of the triangle and the hypothesis (as shown in the attachment).

Note: The Pythagorean Theorm is stated as follows:
(length of hypotenuse)^2 = (length of side1)^2 + (length of side2)^2

7 0

4 years ago

What factors mechanical weathering ?. Earth Science.

OLga [1]

Answer:

-Growth of plants on the rock.

-Temperature and pressure changes in nature.

-Freezing and thawing of water in cracks of the rock.

-Formation of salt crystals within the rock.

-Burrowing by animals.

those are some factors I know

hope this helped you

4 0

3 years ago

Read 2 more answers