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4 years ago

When a hypothesis is tested and shown to be incorrect is the experiment a failure?

1 answer:

6 0

No. Testing hypothesis is part of scientific method, and proving or rejecting then are both valid results of the experiments.

If the hypothesis is shown to be incorrect the experiment is a succesful result. The role of science is to try discover facts and form theory. The rejection of hypothesis also produces knowledges and provide insight leading to the development of science.

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CADMIUM SOLUBILITY AND pH Cadmium is a toxic metal. It can be removed from water by chemical precipitation of solid cadmium hydr

Serga [27]

Explanation:

It is known that,

Molar mass of Cd = 112.41 g/mol

Standard concentration of Cd = 0.005 mg/L = $0.005 \times 10^{-3}$ g/L

Hence, we will calculate the molarity as follows.

Molarity = $\frac{0.005 \times 10^{-3}}{112.41} mol/L$

= $4.45 \times 10^{-8}$ M

Equation for the reaction is as follows.

$Cd(OH)_{2} \rightleftharpoons Cd^{2+} + 2OH^{-}$

$K_{sp} = [Cd^{2+}][OH^{-}]^{2}]$

$2 \times 10^{-34} = 4.45 \times 10^{-8} \times [OH^{-}]^{2}$

$[OH^{-}] = 6.7 \times 10^{-4}$ M

Also,

$[H^{+}] = \frac{10^{-14}}{[OH^{-}]}$

= $\frac{10^{-14}}{6.7 \times 10^{-4}}$

= $1.49 \times 10^{-11} M$

Relation between pH and concentration of hydrogen ions is as follows.

pH = $-log [H^{+}]$

= $-log (1.49 \times 10^{-11} M)$

= 10.82

Thus, we can conclude that a minimum pH of 10.82 is necessary to reduce the dissolved cadmium ion concentration to the standard.

4 0

3 years ago

The Solvay process is a multistep industrial process used to produce washing soda, Na2CO3(s). In the last step of the Solvay pro

olganol [36]

Its IUPAC name is sodium carbonate. It is also known as soda ash. It is the water soluble sodium salt of carbonic acid and occurs as a crystalline heptahydrate. Sodium carbonate has an alkaline taste and when in solution forms a basic solution. One important application is that it is used commonly as a water softener.

6 0

3 years ago

How do I write the formula for: Ferric hydrogen sulphate, Tungsten (V) peroxide, Nitric acid and Aluminum acetate? ...?

hram777 [196]

We write the following substances' chemical formula as follows:

Ferric hydrogen sulphate = Fe(HSO4)3.

Tungsten (V) peroxide = W2(O2)5

Nitric acid = HNO3

Aluminum acetate = C6H9AlO6

Hope this answers the question. Have a nice day.

7 0

3 years ago

Will give brainliest

Vinvika [58]

Answer:

I think its C

Explanation:

it's not A or B

hope this helps

6 0

3 years ago

Arrange the following cellular components in order of decreasing size: hexokinase ribosome CO2 glucose

Novay_Z [31]

Answer:

Ribosome, Hexokinase, Glucose, CO2.

Ribosomes are proteins that sintetize the proteins in the cell, depending of the organism, the can size up to 30 nm. Hexokinase is an enzyme that measures approximately 50 kDa, and in its spatial conformation it sizes about 5 to 6 nm in diameter. Glucose is a molecule that sizes about 1 nm, and CO2 is another molecule that sizes 0.232 nm.

4 0

3 years ago