From the water sample analysis: 40 mg/L Ca+2, 5 mg/L Mg+2, 10 mg/L K+, 10 mg/L SO4-2, and alkalinity which is equal to 122 mg/L as CaCO3. Calculate the TH, CH, and NCH. Also check the classification of water hardness of the water sample.
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From the water sample analysis: 40 mg/L Ca+2, 5 mg/L Mg+2, 10 mg/L K+, 10 mg/L SO4-2, and alkalinity which is equal to 122 mg/L as CaCO3. Calculate the TH, CH, and NCH. Also check the classification of water hardness of the water sample.
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- The total hardness is due to one or a combination of Ca2+, Mg2+, and Fe2+ in your sample. It is convenient to express this hardness as though it was entirely due to Ca2+. Making this assumption, determine the number of moles of Ca2+ present in the bottled water sample titrated. (enter your answer with 3 significant figures) 25.00 ml water sample, 19.040 ml of 4.965x 10−3 M EDTA solution to reach the endpoint.1) How can the following solutions be prepared? Do not forget to include a short instruction in the preparation. a. 100 mL of 40% (w/v) polyethylene glycol (PEG) b. 47 mL of 7% (w/v) solution of sodium chloride (NaCl) c. 200 mL of 95% (v/v) solution of ethanol 2) If 25g of NaCl is dissolved into a final volume of 500mL, what is the percent (w/v) concentration of NaCl in the solution? 3) How will you prepare 200mL of 0.3M NaCl prepared? Include a short instruction in the preparation. 4) From a stock solution of 1M Tris solution, how will you prepare 400mL of 0.2M? Do not forget to include a short instruction in the preparation. 5) How is 4mL of 50mM NaCl solution be prepared from a 2M NaCl stock? Do not forget to include a short instruction in the preparation. 6) What is the molar concentration of a 10% NaCl solution? At 25⁰C, the density of 10% NaCl is 1.09 g/mlCOMPLETE THE STATEMENT: 1. Before manufacturing process begins the sources of suitable fragrances are ______ in the manufacturing centre. 2. Oils are ______ from plants and other substances by several methods 3. During ________, flowers are spread on glass sheets coated with grease. 4. _________is the oldest and least complex method of extraction. 5. During Aging, the_____ tests whether the perfume has the specific smell or not.
- What is the solubility of CdS (Ksp = 1.0 x 10-28) in pure water? 1.0 x 10-7 M 1 x 10-14 M 1.0 x 10-28 M 1.0 x 10-56 Mfood items weighing 10 kg initially have a moisture content of 400% (dry basis). This material is dried to a moisture content of 25% (wet basis), determine how much water is removed from the materialIn what order should the following methods be used to separate a mixture containing sand-sugar-alcohol and water into its components? 1) Adi distillation II) Fractional distillation HII) Filtration under vacuum B. II, I, II C. III, I, II D. 1, III, II E III, II, I
- 4 litres of water obtained from a borewell in Vellore contains FeSO4 = 30.4 mg; CaSO4 = 13.6 mg; MgCl2 = 38 mg; Ca(HCO3)2 = 32.4 mg; Mg(HCO3)2 = 14.6 mg and NaCl = 11.7 mg. Calculate temporary, permanent and total hardness of the water sample in ppm. (Atomic masses of Fe = 56; Ca = 40; Mg = 24 and Na = 23)In the conductivity test, _____________________ is going to result to a brightly lit light bulb. a. 70% v/v ethanol b. 1.0 M citric acid c. Mixture of 10.0 mL 1.0 M Mg(OH)2 and 10.0 mL 1.0 M HNO3 d. Glacial acetic acid. The total cation content of natural water is often determined by exchanging the cations for hydrogen ions on an ion exchange resin. The cations are adsorbed to the resin which releases H+ (1:1 exchange) which can then be titrated with a base. A 25.0 mL sample of a natural water is diluted to 100 mL with distilled water and 2.0 g of a cation-exchange resin was added. After stirring, the mixture was filtered and the solid remaining on the filter paper was washed with three 15.0 mL portions of distilled water. The filtrate and washing required 15.3 mL of 0.0202 M NaOH to reach the equivalence pt. Calculate the number of moles of cation present in 1.00 L of sample.
- 1: What is the molar concentration of a 4% solution of borax? (sodium tetraborate decahydrate, Na2B4O7·10H2O) Group of answer choices A:1.5 x 10^4 M B:65.8 M C:1.049 M D:0.1049 M 2: Calculate the approximate length of PVA strand assuming that each monomer unit contributes two carbon atom diameters to the length. (1 carbon atom diameter = 154 picometers) Group of answer choices A:5.46 x 10^7 nm B:5.46 m C:308 pm D:5.46 x 10^5 pm 3: Calculate and compare the number of strands of PVA in 1.00 L of 4% PVA and the number of tetrahydroxyborate ions in 1.00 L a 4% solution of borax. Group of answer choices A:Borax has more strands than PVA B:Borax has approx. 409 more ions than PVA strands C:PVA has approx. 409 more strands than Borax ions D:Borax has approx. 209 more ions than PVA strandsWhich of the following will cause an instrumental deviation in Beers Law? I. stray light II. unclean optics such as mirrors, lens, and lamps III. fingerprint on the clear area of the quartz cuvette IV. mismatched cell A. I, II, and III only B. I, II, III and IV C. I and III only D. II and IV onlyWrite TRUE if the BOLD word/phrase makes the statement correct. Otherwise, write the correct WORD/PHRASE that will make the statement true. If there are two bold words/phrases in a number, write your answer for EACH of the bold words/phrases. 1. In the extraction of caffeine, NaOH was added to dry the collected organic layer. 2. Purification of caffeine via sublimation was possible because it has a high sublimation point at a temperature above its melting point. 3. The E/Z designation is used to describe the orientation of identical groups in alkenes.