A soltion is made by the addition of 40 ml of 40 mM NaO to 40 of 30 mM phoshork acd What is the final ptof the solon for HPOA pat 2.12. pa721, pka1232 14400
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Q: Problem 1
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- 15. A 300.00 mL solution of 0.00165 M A2B5 is added to a 230.00 mL solution of 0.00380 M C2D3. What is pQsp for A2D5?Approximately 6.0mL of concentrated perchloric acid (70%) was transferred to a bottle and diluted with about 1.0L of water. A sample containing 251.5 mg of primary standard Na2B4O7.10H2O required 27.41 mL of the HClO4 solution to reach the methyl red end point. Calculate the molar concentration of the HClO4 (Fwt = 382g/mole)What is the cobalt(II) ion concentration in a solution prepared by mixing 357 mL357 mL of 0.396 M0.396 M cobalt(II) nitrate with 475 mL475 mL of 0.399 M0.399 M sodium hydroxide? The ?spKsp of cobalt(II) hydroxide is 5.92×10−155.92×10−15 .
- 2.) A 0.2185g sample of NaCl was assayed using Volhard Method with 50mL 0f 0.0998N AgNO3 and 11.9mL of 0.1350N NH4SCN. Calculate the % NaCl in the sample.5. If 0.045 mg of Pb2+ was observed in 1.69 kg of solution what is the ppm?3.) In the assay of NaHCO3, 3.0g of the solid is dissolved in 25mL water. What is the normality? How many mL of 1N H2SO4 will be required to neutralize this solution? From this volume of acid, compute the percent purity of NaHCO3.
- STANDARDIZATION OF NAOH SOLUTION A 0.4047 g sample of primary standard grade potassium hydrogen phthalate (MM = 204.23) was dissolved in distilled H2O. The solution required 22.42 mL of the NaOH solution to reach the phenolphthalein end point. a.) Calculate the number of mmoles of KHP. b.) How many moles of NaOH will react with the KHP dissolved in water? c.) Calculate the molarity of the NaOH solution.A 1.5000-g sample of cereals was analyzed for nitrogen using the Kjeldahl procedure. The receiving flask contained 69 mL of 0.02 M HCl. After the ammonia was collected, the solution was titrated with 0 M NaOH, requiring 11.72 mL to reach the methyl red endpoint. Calculate and percent protein in the sample (f=5.70). Ans. in 3 SFsYou are to make 300mL of 20mM EDTA buffer (C10H16N2O8) solution from powder. How much EDTA powder must be dissolved in water? [Atomic Weight: C = 12.011; H = 1.0079; O = 15.999; N = 14.0067]
- Explain why the conductivity of mixture A is higher than that of mixure B, , yet the pH of A is lower than the pH of B. Include relevant equations in your answer B 0.1 mol L–1 CH3COOH Conductivity (mA) 5 PH 3 A 0.1 mol L–1 HCl 260 1As solution was prepared by dissolving 5.76g of KCl.MgCl2.6H2O (277.85g/mol) in sufficient water to give 2.000L. calculate a. pMg for the solution b. pCl for the solutionA lab wishes to analyze apple juice. They would like each milliliter of titrant equal to 0.1% of malic acid. Sample aliquots will all be 10 mL. The Eqwt of malic acid is 67. What base normality should be used?