2- SiO₂(k)+ HF(s)-SIF(g) + H₂O(s) (SI: 28, 0:16, H:1, F: 19 g/mol, R-0,082 atm.L/mol.K) tepkimeye göre yoğunluğu 1,15 g/mL olan 42 ml. HF ve 54,06 g SiO₂ tepkimesi sonucu oluşan gazın 1 atm basınç ve 131 "C'deki hacmi kac litredir? 30 b) 40 10 20 50 Boş bırak Kapat ✔Sinavi Bitir
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- How much magnesium chloride hexahydrate (MW = 203.3 g/mol) is required to make a 500 mL solution at a concentration of 10 mmol/L? 203.30 mg O1.017 g O 1016.50 g 10.17 g 2.033 gAn antacid tablet (such as Tums or Rolaids) weighs 1.3259 g. The only acid-neutralizing ingredient in this brand of antacid is CaCO3. When placed in 12.07 mL of 1.070 M HCl, the tablet fizzes merrily as CO2(g) is givenoff. After all of the CO2 has left the solution, an indicator is added, followed by 11.74 mL of 0.5310 M NaOH. The indicator shows that at this point the solution is definitely basic. Addition of 5.12 mL of 1.070 M HCl makes thesolution acidic again. Then 3.17 mL of the 0.5310 M NaOH brings the titration exactly to an endpoint, as signaled by the indicator. Compute the percentage by mass of CaCO3 in the tablet.What mass of Co(s) may be deposited from an aqueous CoCl, solution if a current of 2.50 A is applied to the solution for 365 s? (e*rea(Co2*/Co) = -0.277 V, F = 96485 Cimol) 0.557 g 0.279 g O 1.01 g O 1.11 g 0.0772 g
- Prepare 1.5L 2X Base stock in a media bottle: Fill out the last column of this table: Component MgCl.6H20 (NH4)2SO4 H3PO4 (85%) КСІ EDTA 1X concentration 0.52 g/L 12 g/L 1.6 mL/L 0.12 g/L 0.1 g/L 2X (Provide unit)As a technician in a large pharmaceutical research firm, you need to produce 200. mL of 1.00 M potassium phosphate buffer solution of pH = 6.96. The pKa of H2 PO4 is 7.21. %3D You have the following supplies: 2.00 L of 1.00 M KH2PO4 stock solution, 1.50 L of 1.00 M K2HPO4 stock solution, and a carboy of pure distilled H2O. How much 1.00 M KH2PO4 will you need to make this solution? Express your answer to three significant digits with the appropriate units. > View Available Hint(s) HẢ Volume of KH2PO4 needed = Valıxe Units SubmitPlease answer this NEATLY, COMPLETELY, and CORRECTLY for an UPVOTE. Co(NO3)2 (or CoCl2)From the stock solution (1.0 M), determine the volume needed to prepare 0.00, 0.04, 0.08, 0.12 and 0.16 M Co(NO3)2 solution in 50 mL volumetric flask. Obtain the calculated amounts, place in corresponding volumetric flasks and dilute to mark.
- how much does dextrose in 300 ml of a D5 W solution, a. 100g, 175g, 125 g, 150gA buffer contains 0.015 mol of lactic acid (pK₁ = 3.86) and 0.080 mol of sodium lactate per liter. H₂C OH Lactic acid OH Calculate the pH of the buffer. H₂C. Calculate the change in pH after adding 9.0 mL of 0.10 M HCl to 1.0 L of the buffer. O OH Sodium lactate Calculate the change in pH after adding 9.0 mL of 0.10 M HCl to 1.0 L of pure water. O Na+ buffer pH: buffer pH change: water pH change: units unitshow many grams of sr(no2)2 are needed to make 200 ml of 0.300M solution of sr(no2)2
- How many liters of a 7 M NaOH stock solution would you need to make 780 mL of a 153 mM NaOH dilution? (m.w. = 40.00 g/mol)21 Rx KCI Sımple syrup Cherry syrup aa ad 5 mL Sig: I tsp (15 mEg) tid. x 12 days Note: molecular weight of KCI is 74.5 A How many grams of KCI is required to fill this prescription? D. How much simple syrup in milliliters is required to prepare this prescription? (assume KCI occupies no volume) 9.5BSA mg/ml O.D. 550nm 1 0.12 2 0.23 3 0.34 4 0.41 0.52 Use the values above to draw a graph