Chemistry, 27.08.2020 05:01 Perez1957

200ml hard water was boiled with 100ml N/50 Na2CO3 reagent. After boilingg the volume was again made to 200mand the solution filtered. 25ml of this filtrate required 8.2ml of N/50 HCl for neutralisation

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Answer from: SmoothCruzito16

Here is the full question:

200ml hard water was boiled with 100ml N/50 Na2CO3 reagent. After boilingg the volume was again made to 200mand the solution filtered. 25ml of this filtrate required 8.2ml of N/50 HCl for neutralisation.

Calculate the permanent hardness in ppm.

Explanation:

Remember that the hard water was boiled with 100ml N/50 Na2CO3 reagent. Therefore, the milliequivalent of carbonate ion in 100 ml of N/50 Na2CO3 solution is given as 100 × $\frac{1}{50}$ = 2

The solution was made of 200 ml and 25 ml of the filtrate was neutralised with 8.2 ml N/50 HCl.

The milliequivalent of carbonate ions remaining in the filtrate is $\frac{200}{25}$ × 8.2 × $\frac{1}{50}$ = 1.3 milliequivalent

To get the milliequivalent of carbonate ion precipitated, we need to subtract the milliequivalent of the two carbonate ions. This will give us

2 − 1.3 = 0.7g

The amount of CaCO3 present in 200 ml water = 0.7 × 50 = 35g

Permanent hardness = $\frac{35}{200}$ × 1000 = 175 ppm.

Answer from: Quest

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

Answer from: Quest

answer: any goods being imported from another country may be subject to issued by the federal government are tariffs

explanation:

tariffs are a tax on anything that are imported from abroad. government use them to protect and boost their local industries and the thought is that they encourage consumers to buy local instead of importing and they will hope will protect jobs and economy in the country that implements them

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