(10 6-13. Determine the lime and soda ash dose, in mg/L as CaCO3, to soften the 4-5 following water to a final hardness of 80.0 mg/L as CaCO3. The ion con- centrations reported below are all mg/L as CaCO3. Ca2+ = 120.0 Mg2+ = 30.0 HCO3 = 70.0 CO₂ = 10.0

Match the stability to the clay type: Kaolinite Choose. Choose Intermediate stability Ilite Montmorillonite Least stable Most stable

Which type of hardness can be removed by Boiling? Select one: a. Permanent and Temporanry Hardness b. Temporary Hardness C. None of the answers d. Permanent Hardness

A commercial screen cloth of market grade is used to separate different fractions of 300 m3/hr of crystals obtained from crystallization via nucleation process in a cylindrical vessel of 3 m height and 9.25 m OD of thickness 3.6 cm. The properties of the slurry are: MT = 220 g/L; ρ = 1.26 g/mL; φ = kv = 0.97 Mesh Sizes  wt % -7 mesh +9 mesh  1.68 -9 mesh +12 mesh  2.31 -12 mesh +14 mesh  2.12 -14 mesh +18 mesh  13.90 -18 mesh +24 mesh  32.89 -24 mesh +40 mesh  45.78 -40 mesh   Find:a. Kinetic equationb. Dominant particlec. What is the cumulative weight fraction at 700 microns?

Real clay crystals are not pure silicates or aluminates. a. True b. False

Montmorollonite clay is the same as illite clay except for the potassium cations Select one: True False

The block shown is made of a magnesium alloy for which E=X2GPaand ϑ=0.35. Knowing that σx= X1 MPa, determine (a) the magnitude of σyfor which the change in the height of the block will be zero, (b) the corresponding change in the area of the face ABCD, (c) the corresponding change in the volume of the block.

7) As a result of the analysis of raw water, the total ion concentration was found to be 200 mg/L. Since the concentration of calcium ions in the raw water is four times the concentration of magnesium, calculate the total hardness in this raw water in terms of calcium carbonate. (Ca*: 40 g/mol, Mg: 24 g/mol, C: 12 g/mol, O: 16 g/mol).

Sodium hexa-metaphosphate and sodium silicate are used as the dispersion agent in the hydrometer analysis.How does this dispersion agent work?

Question 3: The block shown is made of a magnesium alloy for which E=760GPa and 9 =0.35. Knowing that o=157 MPa, determine (a) the magnitude of o, for which the change in the height of the block will be zero, (b) the corresponding change in the area of the face ABCD, (c) the corresponding change in the volume of the block.