In supposing that a linear relationship exists between the readings taken from the apparatus and the sulphur ion concentration, derive an equation relating readings of the turbidometer and sulphate concentration (method of least squares). ii. Calculate the concentration of sulphate in a sample of mineral water for which the turbidometer gives a reading of 3.67.
Q: The concentration of the sulphate ion in a mineral water can be determined
by the turbidity which results from the addition of excess BaCl2, to a quantity
of measured sample. A turbidometer used for this analysis has been standardised
with a series of standard solutions of NaSO4. The following results
were obtained:
Standard solution Conc. (SO4)
2− (mg/L) Reading of turbidometer
S0 0.00 0.06
S1 5.00 1.48
S2 10.00 2.28
S3 15.00 3.98
S4 20.00 4.61
i. In supposing that a linear relationship exists between the readings taken
from the apparatus and the sulphur ion concentration, derive an equation
relating readings of the turbidometer and sulphate concentration
(method of least squares).
ii. Calculate the concentration of sulphate in a sample of mineral water
for which the turbidometer gives a reading of 3.67.
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