What would be observed a. 1 mL of 0.1 N KMnO4, in 4 mL of dilute H2S04 and a few mg of Sodium Metaborate Peroxyhydrate. b. If potassium or sodium perchlorate is substituted for Sodium Metaborate Peroxyhydrate c What is the ph if Sodium Metaborate Peroxyhydrate is dissolved in 5ml of water
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What would be observed
a. 1 mL of 0.1 N KMnO4, in 4 mL of dilute H2S04 and a few mg of Sodium Metaborate Peroxyhydrate.
b. If potassium or sodium perchlorate is substituted for Sodium Metaborate Peroxyhydrate
c What is the ph if Sodium Metaborate Peroxyhydrate is dissolved in 5ml of water
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- b. A student has a sea water sample which contains Ca2+ ions . Describe briefly how he willdetermine the concentration of Ca2+ ion in the sample using a simple titration. Explain the colourchanges at the endpoint. Which medium is suitable for performing the titration, acidic or basic medium and why?Which of the following statements is advantageous? A). The main differences between potentiometric and conductometric titrations are that potentiometric titrations exemplify the analyte sample-by-sample while conductometric titrations show the potential of the analyte B). A conductivity is analyl from the people of the charge. C.) Conductivity increases rapidly as close as equivalence, as a strong acid and a strong base will decrease D). The conductor remains constant according to the viscosity of the pixel, the decomposer and its size, which consists of design modelling.A substance X was shown to be a weak acid with a single pKa value of 3.00. Using the, a 1.0-L buffer solution (pH 2.50, 0.15 M) is to be prepared. What are the concentrations of the weak acid (MW = 65 g/mol) and its conjugate base (NaX, MW = 87 g/mol) , respectively?
- Chemistry A 20 mL solution containing both Ca2+ and Mg2+ cations is diluted in to 100 mL. When 10 mL of this solution is taken and titrated with 0.05 M EDTA at pH = 10 in the presence of Erio – T indicator, the consumption is found as 12 mL. A new 10 mL was taken from the same solution and (NH4)2C2O4 is added on it and then formed the precipitate is filtered. The filtered solution is titrated with the same EDTA solution and the consumption is found as 3 mL. So find the Ca2+ and Mg2+ amounts in the main sample solution in terms of mg/L.Describe the preparation of 100 mL 0.050 M and 100 mL 0.0050 M phosphate buffer (both having pH = 6.5) using: a. a stock solution of 0.50 M phosphate buffer (pH = 6.5)b. solid NaH2PO4∙2H2O and solid Na2HPO4∙2H2O. For H2PO4- ⇌ HPO42-, Ka = 6.32 × 10-8.The Henderson-Hasselbalch equation: a. relates the pH of a solution to the pKa and the concentration of acid and salt. b. allows the graphical determination of the molecular weight of a weak acid from its pH alone. c. is equally useful with solutions of acetic acid and of hydrochloric acid. d. employs the same value for pKa for all weak acids.
- For the complexiometric titration of Ca2 + ions in the shell of the egg sample weighing 62,576 g, the necessary procedures were applied to the egg shells and 100 mL sample was prepared. 1 mL of the prepared sample was taken and diluted to 100 mL, the pH was adjusted, and two drops of EBT indicator were dropped on it. The solution prepared was titrated with 23.6 mL of 0.0095 M EDTA solution. Which of the following is the amount of calcium in the sample in terms of% CaCO3? (Ca: 40, C: 12, O: 16 g / mol) A. 5.83B. 10.96C. 3.58D. 7.42A student has a sea water sample which contains Ca2+ ions . Describe briefly how he willdetermine the concentration of Ca2+ ion in the sample using a simple titration. Explain the colourchanges at the endpoint. Which medium is suitable for performing the titration, acidic or basic medium and why?For the complexiometric titration of Ca2 + ions in the shell of the egg sample weighing 62,576 g, the necessary procedures were applied to the egg shells and 100 mL sample was prepared. 1 mL of the prepared sample was taken and diluted to 100 mL, the pH was adjusted, and two drops of EBT indicator were dropped on it. The prepared solution was titrated with 23.6 mL of 0.0095 M EDTA solution. What is the value of the amount of calcium in the sample in terms of% CaCO3? (Ca: 40, C: 12, O: 16 g / mol)
- A 0.4071-g sample of CaCO3 (MM: 100.09 g/mole) is transferred to a 500-mL volumetric flask, dissolved using a minimum of 6 M HCl, and diluted to volume. A 50.00-mL aliqout of this solution was mixed with 5 mL of a pH 10 NH3-NH4Cl buffer that contains a small amount of Mg2+--EDTA to adjust the pH to 10. After adding calmagite as an indicator, the solution is titrated with the EDTA, requiring 42.63 mL to reach the end point. Report the molar concentration of EDTA in the titrant. 9.543 x 10-3 M 5.748 x 10-3 M 3.266 x 10-4 M 1.018 x 10-4 MUsed to relieve skin itching, calamine is a mixture of zinc oxide and iron oxide. 5g of dried calamine is dissolved in acid and diluted to 250 mL. Potassium fluoride is added to 25 mL of this solution to mask the iron; After the pH is adjusted to a suitable value, 40 mL of 0.014 MEDTA is spent for Zn2+. The second 50 mL aliquot is buffered to an appropriate value and titrated with 2 mL of 0.03M ZnY² solution. Fe^3+ + ZnY^2- ------> FeY^-1 +Zn^2+ Calculate the percentages of ZnO and Fe2O3 in the sample (MaZnO-81.39g/mol, Fe2O3-159.69g/mol)For the complexiometric titration of Ca2 + ions in the shell of the egg sample weighing 62.576 g, the necessary procedures were applied to the egg shells and 100 mL sample was prepared. 1 mL of the prepared sample was taken and diluted to 100 mL, the pH was adjusted, and two drops of EBT indicator were dropped on it. The prepared solution was titrated with 23.6 mL of 0.0095 M EDTA solution. Which of the following is the amount of calcium in the sample in terms of% CaCO3? (Ca: 40, C: 12, O: 16 g / mol)