Which substance is used to remove rust from metal

Chemistry

2 answers:

Anvisha [2.4K]3 years ago

7 0

hydrochloric acid (HCl)

wel3 years ago

3 0

Chemically speaking, rust is a base and any acid will remove it. The choice of acid is going to be the thing to consider, since acid + base = salt and water. Phosphoric acid left a residue because the salt Iron phosphate is insoluble in water. Iron's soluble salts include the chloride, the sulfate and the nitrate. Industrially speaking, you need to "pickle" your iron. Pickling is a process in which dilute sulfuric acid is used to remove any surface corrosion prior to either painting or plating an iron surface. Sulfuric acid is ordinary battery acid and the salt Iron sulfate is not toxic. Sulfuric acid is one of the most common acids used (besides hydrochloric acid). The dilute kind is not terribly corrosive but concentrated sulfuric acid is a thick, syrupy liquid which can cause some nasty chemical burns if allowed to remain on the skin. It also heats up quite a lot when water is added, so this is an "Acid to water not water to acid" situation. The other choice is Hydrochloric acid, known as muriatic acid. The 20% concentrate is available in nearly any hardware store. It isn't as corrosive as concentrated sulfuric acid, but it has a burning, acrid stench, so never use the concentrate without adequate ventilation. It is ordinarily used to remove hard water deposits (boiler scale) but does a good on on rust as well. Concentrated Iron chloride isn't entirely inert but lots of rinsing will turn it back into harmless rust/sludge, especially if the rince water is naturally hard. Nitric acid will remove corrosion from anything, but it is extremely corrosive, smells worse then Hydrochloric acid and isn't easy to get, since it can be used to create some powerful explosives

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45.6 mL of 0.0600 M Ba(OH)2 is added to 25.0 mL of HCl of unknown concentration. What is the concentration of HCl?

Alex Ar [27]

45.6 mL of 0.0600 M of $Ba(OH)_{2}$ is added to 25.0 mL of HCl of unknown concentration then , the concentration of HCl is 0.032 M .

Calculation ,

Formula used : $M_{1} V_{1}$ = $M_{2} V_{2}$ ...( 1 )

Where $M_{1}$ = concentration of $Ba(OH)_{2}$ = 0.0600 M ( given )

$M_{2}$ = concentration of HCl = ? ( to be find )

$V_{1}$ = volume of $Ba(OH)_{2}$ = 25.0 mL ( given )

$V_{2}$ = volume of HCl = 45.6 mL ( given )

Now , put the value of all volume and concentration in equation ( 1 ) we get .

0.0600 M × 25.0 mL = $M_{2}$ × 45.6 mL

$M_{2}$ = 0.0600 M × 25.0 mL / 45.6 mL = 0.032 M

Therefore , concentration of unknown concentration of HCl is 0.032 M .

to learn about concentration here ,

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1 year ago

Should couples wanting to start a family undergo genetic testing to minimize risk to their offspring

uysha [10]

Answer:

Yes

Explanation:

The genetic testing is also called as the DNA testing. It is mainly used for identifying the changes in the DNA sequence or the chromosomes structure. It can also measure the results in the genetic changes.

Couples those who are planning to start a family should go for a genetic testing so as to minimize a risk in the upbringing or growth of their offspring. By doing a genetic testing a couple can well know the conditions of the baby that could affect them. The result from a genetic testing can help to plan better before starting a family. Therefore, it is advisable for couples to go for a genetic testing so that they plan better by knowing the conditions.

5 0

3 years ago

Hydrogen bonding between polyamide chains plays an important role in determining the properties of a nylon such as nylon 6,6. Dr

Eduardwww [97]

Answer:

See figure 1

Explanation:

In the structure of nylon 6,6 we have amide groups. In this functional group, We have a nitrogen bond to hydrogen, so in this bond, we will have a dipole, due to the electronegativity difference. Nitrogen has more electronegativity than hydrogen, therefore a positive dipole would be generated in the hydrogen atom. Additionally, in the carbonyl group (C=O) due to the oxygen, we will have also a dipole, in this case, a negative dipole because the oxygen atom has more electronegativity (compare with carbon).

When we put two strings of nylon 6,6 the positive dipole will interact with the negative dipole and vice-versa and we will obtain the "hydrogen bonds".

See figure 1

I hope it helps!