Calculate the molarity of a solution prepared by dissolving 13.0 g of Na₂CrO, in enough water to produce a solution with a volume of 600 mL Express the molarity to three significant digits.
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- You receive an order for 24 mEq calcium gluconate in 50 mL normal saline. What volume, in mL, of calcium gluconate 10% stock solution is needed to provide the number of mEq ordered? Cation Aluminum Ammonium Calcium Ferric Ferrous Lithium Magnesium Potassium Sodium Formula Valence Formula weight A13+ 3 1 2 3 2 1 2 1 1 NH₂+ Ca²+ Fe³+ Fe2+ Li+ Mg2+ K+ Na+ 27 18 40 56 56 7 24 39 23 Anion Acetate Bicarbonate Carbonate Chloride Citrate Gluconate Hydroxide Lactate Phosphate, monobasic Phosphate dibasic Sulfate Formula Valence C₂H30₂ 1 HCO3 1 CO3²- 2 CI- 1 3 1 1 1 1 C6H5O7³- C6H₁107 OH- C6H5O3 H₂PO4 HPO4²- SO₂²- 2 2 Formula weight 59 61 60 35.5 189 195 17 89 97 96 96The results observed in a patient admitted to an emergency department with confusion and oliguria were reviewed (reference ranges are given in brackets): Sodium Potassium Urea Creatinine Alkaline phosphatase Alanine aminotransferase Albumin Bilirubin Calcium 146 mmol/L 7.2 mmol/L 18.5 mmol/L 256 μmol/L 319 IU/L 32 IU/L 42 g/L 13 μmol/L 2.47 mmol/L (135-145) (3.5-5.0) (3.5-6.6) (70-150) (95-320) (a) What is the electrolyte abnormality in this patient? (b) What do the data suggest? (c) What action should you take? (5-42) (35-50) (<17) (2.12-2.62) The sample was not visibly haemolysed and was centrifuged and analysed in the labora- tory within one hour of being collected.DATA Determine the Molar concentration of your dilutions using the formula M₁V₁ = M₂V₂. The initial molarity is 0.0001M (1x10-4M). M1 V1 1.56E-06 500uL Concentrations Tube 1 1.56E-06 Tube 2 Absorbance Tube 1 Tube 2 M2 Tube 3 Tube 3 V2 1000uL Tube 4 Tube 4 Tube 5 Tube 5 Tube 6 Tube 7 Tube 6 Tube 7 Tube 8 Tube 8 Tube 9 Tube 9 Tube 10 Tube 11 Tube 10 Tube 11 10
- Estimate the pH of a 7.18 x 106 M HF solution. You can calculate the lowest possible pH, knowing that the actual value will be higher. Your answer should contain 3 decimal places as this corresponds to 3 significant figures when dealing with logs. pH will be above Select the solution with the highest pH. Multiple Choice 0.0225 MLIOH 0.0225 MH2CO3 0.0225 MCH3NH2You receive an order for “heparin 6,000 units SQ q 12 hrs”. The stock solution contains heparin 5,000 units per 0,5 mL. How many milliliters must be administered?A student needs 240 mL of a 1/20 dilution of an undiluted stock solution. What volume (mL) of the stock solution will be required? Note: Your answer should be in numerical format to the nearest whole number (with a decimal).
- Lab Data Verify your concentration calculation. Did you report your data to the correct number of significant figures? Stock solution Concentration iron(III) nitrate 0.40000 [Fe(NO3)a] (M) Color of iron(III) nitrate yellow Concentration potassium thiocyanate [KSCN] (M) 0.00300 Color of potassium thiocyanate colorless Volume iron(III) nitrate (mL) 10.00 Volume potassium thiocyanate (mL) 2.00 Volume DI water (mL) 8.00 Concentration iron(III) thiocyanate ion in stock solution [FESCN2"] (M) 0.000300 Color of stock solution red-orange Diluted solutions Solution 1 Solution 2 Solution 3 Volume stock solution (mL) 4.00 4.00 4.00 Volume DI water (mL) 1.00 2.00 3.00 Concentration iron(III) thiocyanate ion [FeSCN2*] (M)Refer to the titration curve in answering the questions: 13. 12 11 10 9 등 8 7 6 5 4 3 0 -~ 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 Volume of Titrant / mL Unknown Acid 0.10 mol/L - titrant = NaOH 0.1 mol/L 1. Which of the following is True in terms of the relative concentrations of analyte species for the unknown acid at pH 7.0? A. [H₂A] > [HA] B. [H3A]> [H₂A] C. [H₂A] <[HA] D. [HA] < [A] E. [H₂A] = [HA] 2. The value of the first equivalence point is equal to? 3. The value of the first pKA is? tenths) (answer must be in nearest 4. In the unknown acid above, how many ionizable protons are actually present? 5. An unknown acid in the figure above was titrated with 0.10 M of NaOH (titrant) (note: n is the number of ionizable protons) In the titration curve above, how many equivalence points are actually present?What is the molarity of a 30% solution of NaCI
- You are supplied with the following: / Jy word voorsien van die volgende: NaCl (Mr= 58,443 g /mol) 2.5M Tris-Cl, pH 8 solution /oplossing (1 Litre) EDTA (Mr= 380,2g/mol) 10% sodium dodecyl sulphate solution / natriumdodecyl sulfaat oplossing Proteïnase K solution / oplossing (50 mg dissolved / opgelos in 1 ml ddH2O) You need a digestion buffer consisting of the following: / Jy moet 'n verteringsbuffer op maak wat uit die volgende bestaan: 15m M NaCl 75 mM Tris-Cl,pH 8 16 mM EDTA,pH 8 0.8% sodium sulphate / natrium dodecyl sulfaat 0,75 mg/ml proteïnase K How will you prepare 500 ml of the digestion buffer? Show all your steps and calculations. Remember to explain exactly how you will make it up. / Hoe sal jy 500 ml van die verteringsbuffer voorberei? Wys al jou stappe en berekeninge. Onthou om te verduidelik presies hoe jy dit sal op maak.Solution Absorbance mg/ml aspirin Standard solution - 1.6 mg/mL A 0.638 0.08 mg/mL B 0.504 0.064 mg/mL C 0.376 0.048 mg/mL D 0.259 0.032 mg/mL E 0.126 0.016 mg/mL A = -log T where T = %T ÷ 100 Construct a callibration curve using the above data. Absorbance should be on the vertical axis and "mg/mL of acetylsalicylic acid" on the horizontal axis. The line should go through the origin. Using the data provided, the graph you have generated, and the procedure that was used to generate the solutions which were examined by spectroscopy, calculate the amount of acetylsalicylic acid per tablet. Commercial tablet 1 labelled as 100 mg enteric coated Absorbance = 0.16 Commercial tablet 2 labelled as 300 mg Absorbance = 0.45 Student prepared tablet from practical 5 Absorbance = 0.19 Using the data provided, the graph you have generated, and the procedure that was used…Volume Base: Additives Concentration Potassium Acetate 2 mEq/mL Dose Ordered Volume (mL) mL 30 mEq 12.5 mL Sodium Chloride 4 mEq/mL 50 mEq mL Ca Gluconate 0.465 mEq/mL 8 mEq 322 10 mL MVI-12 10 mL mL Famotidine 10 mg/mL 40 mg LI5. mL Volume Additives: mL Final Volume: Calculate the amount of Sterile Water for Injection needed to qs the total volume to 1,000 mL. mL Sterile Water: mL How many mLs should you remove from your Dextrose 70% bag? ccess Code Inside ources on Evolve