Question

200 ml of a sample of water required 20ml N/50 H2SO4using methyl orange as indicator but didnot give any colouration with phenolphthalein. What type of alkalinity is present? Express thesame in mg/L

Answer 1

Answer:

Numerical from Alakalinity1.200 ml of a sample of water required 20ml N/50 H2SO4using methyl orange as indicator but didnot give any colouration with phenolphthalein. What type of alkalinity is present? Express thesame in mg/L.2.200 ml of a sample required 20ml of N/50 HCl using methyl orange as indicator. Another 200 mlof the same sample required 8 ml of N/50 HCl using phenolphthalein as indicator. Express thealkalinity in terms of mg of CaCO3per liter.3.A sample of water was alkaline both to phenolphthalein and methyl orange 0.50 ml of this watersample required 15 ml of N/50 H2SO4for phenolphthalein end point and another 10 ml forcomplete neutralization. Calculate the type of alkalinity in ppm.4.A water sample is not alkaline to phenolphthalein. However, 100 ml of the sample water ontitration with N/50 HCl, required 16.9 ml to obtain the end point, using methyl orange asindicator. What are the types and the amounts of alkalinity present in the sample.5.100 ml of water sample, on titration with N/50 H2SO4using phenolphthalein as indicator, gavethe end point when 5 ml of acid were run down. Another lot of 100 ml of the same also required5ml more acid with same strength for methyl orange end point. Calculate alkalinity present inwater.6.A water sample is alkaline to both phenolphthalein as well as methyl orange. 100 ml of watersample on titration with N/50 HCl required 4.7 ml of the acid to phenolphthalein end point.When a few drops of methyl orange are added to the same solution and the titration furthercontinued, the yellow colour of the solution just turned red after addition of another 10.5 ml ofthe acid solution. Elucidate on the type and extent of alkalinity present in the water sample.7.There is change in colour of the alkaline water on addition of 12 ml of N/100 HCl , as a result ofthis titration only one ion present in water. Deduce the concentration or amount of that ion inrequired 50 ml of water

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Answer 2

Answer:

Type of alkalinity is hydroxide (OH).

Step-by-step explanation:

Alkalinity is defined as the buffering capacity of a water body.

It is a measure of the ability of the water body to neutralize acids and bases and thus maintain a stable pH level.

It is of three types:

Alkalinity can exist in water in three basic forms: carbonate (CO3), bicarbonate (HCO3), or hydroxide (OH).
Here, $200 ml$ of a sample of water required $20ml N/50$ H2SO4using methyl orange as indicator but do not give any coloration with phenolphthalein.

Phenolphthalein is a weak acid and is colorless in solution although its ion is pink.

It turns purple if it meets something basic, such as ammonia and it stays colorless if it meets an acid like vinegar or a neutral substance like water.

It has met with an acid.

Type of alkalinity is hydroxide (OH).

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