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- (b) Using appropriate chemical reactions for illustration, show how calcium present as the dissolved HCO3- salt in water is easier to remove than other forms of hardness, such as dissolved CaCl2. (c) A water has the following analysis: mg/l mg/l Na+ - 20 Cl- - 40 K+ - 30 HCO3- - 67 Ca2+ - 5 CO32- - 0 Mg2+ - 10 SO42- - 5 Sr2+ -2 NO3- - 10 What is the total hardness, carbonate hardness and noncarbonated hardness in mg/l as CaCO3.As the imfa becomes stronger, w/c of the ff properties increases? boiling point, vapor pressure, mass,melting point, densityWhat iare the reaction equations of the following: (a) 5g of Na2SO3(s) is mixed with 30 ml of distilled water and disolved (b) 6g of CuCl2.H2O(s) is mixed with 20 ml of distilled water and disolved, (c) the solution from (b) is poured into (a) and then then 20ml of 0.001M H2SO4+ is added (d) The CuCl white crystalls are filtered and washed three times with 10ml ethanol and 20ml 0.001M H2SO4+ is added
- 2. Calculate the molar concentration of the nitric acid if you know that specific gravity is 1.42 and the percentage is 70% to prepare. Solution has concentrated of 0.4 M in 100ml of distilled waterGiven: 0.35g NaCl, 0.25 g NaHCO3, 0.15 g KCl & 2 g C6H12O6 are present in 100 mL ORS solution (MW: Na: 23, K: 39, Cl: 35, H: 1, C: 12, O: 16) Calculate the total amount of chloride expressed in mmol/L present in the prepared solution 60.34 mmol/L 90.10 mmol/L a 111.11 mmol/L b 29.76 mmol/L c 80.61 mmol/L d 20.27 mmol/LIMFA of water and sodium chloride
- What is the dominant iron species in water samples ? What environmental factors may have contributed. why is it necesseyy to to investigate Fe3+ concentration and total Fe concentration dpeedtaely ? Why do we need to do the sample to determine total Fe concentration ? And how did then determine Fe2+ concentration?A sample of water contains 4 mg/L of Ca2+, calculate the hardness in mg/L as CaCO3How will you decrease the solubility in water of MnSO4•H2O a. Put the solution in ice bath b. Put the solution in hot water bath c. Put Na2SO4 into the solution d. Stirring the solution hardly
- The stock concentration of EDTA is 0.25M. Calculate the volume of EDTAneeded to prepare 250 ml of 100 mM EDTA.35.00ml of 0.450 M sodium hydroxide was reacted with 12.00ml of 0.500M H3PO4 solution. What’s the LR? And how many ml of water will be producedA piece of an unknown weighing 12.50is placed in 49.7cm of water in a cylinder. The water level increases to 69.0cm3. whats the calculated value for the drnsity of the solid in g ml-1
