The degree of hardness of a given sample of hrad water is 40 ppm if the entire hradness is due to `MgSO_4` how much of `MgSO_4` is present per kg of water?

The degree of hardness of a sample of water is 40 ppm. If the hardness is only due to the presence of "MgSO"_(4) , then determine the amount of "MgSO"_(4) in 1 kg of that water.

Calculate the degree of hardness of a sample of hard water which is found to contain 72 mg of "MgSO"_(4) per kg of water.

Degree of hardness of 1L sample water containing 0.002 mol "MgSO"_(4) is -

What is the degree of hardness of a sample of water containing 24 mg of MgSO_4 (molecular mass 120) per kg of water ?

What will be the hardness of a sample of water, 10^(6) g of which contains (1)/(6) mol A l_(2)(SO_(4))_(3) ?

DO value of a water sample is 6 ppm. Calculate the weight of dissolved oxygen present in 100 Kg of water sample.

COD value of a water sample is 40 ppm, Calculate the amount of acidified K_2Cr_2O_7 required to oxidise the organic matter present in 500 ml of that water sample.

Earth gains energy from the sun at a rate of 8.4 J cdot cm^(-2) cdot "min"^(-1) . A black coloured calorimeter, having water equivalent of 15g, contains 100 g water at 25^(@)C . The calorimeter is kept at the focus of a convex lens facing the sun. If the aperture of the lens is 1000 cm^(2) , how much time will the water take to reach its boiling point?

MgSO_(4) is soluble in water but BaSO_(4) is not because-