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- Sodium carbonate is a reagent that may be used to standardize acids in the same way that you have used KHP in this experiment. In such a standardization it was found that a 0.498-g sample of sodium carbonate required 24.8 mLmL mL of a sulfuric acid solution to reach the end point for the reaction. Na2CO3(aq)+H2SO4(aq)→H2O(l)+CO2(g)+Na2SO4(aq)Na2CO3(aq)+H2SO4(aq)→H2O(l)+CO2(g)+Na2SO4(aq) What is the molarity of the H2SO4H2SO4?What is precipitation from homogeneous solution; what are the benefits of this method.A student performed a titration to determine the exact concentration of NaOH(aq). The titration was performed against a standard 0.1000 M HCl(aq) solution. Phenolphthalein indicator was used. The following end-point volumes were recorded by the student in units mL: Trial Number Volume 1 25.06 2 25.15 3 25.02 4 25.17 5 25.07 Calculate the 95% confidence limit. Assume that there is no outlier. Provide your answer to the correct number of decimal places, without units, and without the ± sign. Use the T-table shown below.
- After removing the membranes from an eggshell, the shell is dried and its mass recorded as 5.613 g. The eggshell is transferred to a 250–mL beaker and dissolved in 25 mL of 6 N hydrochloric acid solution. After filtering, the solution containing the dissolved eggshell is diluted to 250 mL in a volumetric flask. A 10.00–mL aliquot is placed in a 125–mL Erlenmeyer flask and buffered to a pH of 10. Titrating with 0.04988 M EDTA requires 44.11 mL to reach the end point. Determine the amount of calcium in the eggshell as % w/w calcium carbonate.Explain why a dispersion of silver nanoparticles coated with an amine functionalised polymer would be more stable at low pH than high pH.Give some examples of secondary standard solutions, and give the reason
- Treatment of ammonia with phenol in the presence of hypochlorite yields indophenol, a blue product that absrobs light at 625 nm, which çan be used for the spectrophotometric determination of ammonia. gan OCF OH + NH3 indophenol anion To determinè the ammonia concentration in a sample of lake water, three samples are prepared. In sample A, 10.0 mL of lake water is mixed with 5 mL of phenol solution and 2 mL of sodium hypochlorite solution, and diluted to 25.0 mL in a volumetric flask. In sample B, 10.0 mL of lake water is mixed with 5 mL of phenol solution, 2 mL of sodium hypochlorite solution, and 2.50 mL of a 5.50 x 10-4 M ammonia solution, and diluted to 25.0 mL. Sample C is a reagent blank. It contains 10.0 mL of distilled water, 5 mL of phenol solution, and 2 mL of sodium hypochlorite solution, diluted to 25.0 mL. The absorbance of the three samples is then measured at 625 nm in a 1.00 cm cuvette. The results are shown in the table. Sample Absorbance (625 nm) A 0.361 B 0.608 C…What are the applications of re-crystallization in gravimetric analysis? answer at your own words and answer should be to the point, not any irrelevant wordsHow are conductivity and TDS related? Why is conductivity important in water? What happens if conductivity of water increases? In the titration why the colour changes from wine red to blue? What are the harmful effects of hard water? Write the principle involved in hardness of water by EDTA method?
- Differentiate adsorption, ion exchange, and solvent extraction in terms of their efficiency when solute concentration is increased.A student used 10 mL water instead of 30 mL for extraction of salt from mixture. How may this change the percentage of NaCI extracted?The amino acid serine has two pKa values, one for its carbonyl group (pKa = 2.21) and one for its NH3+ group (pKa = 9.15).These pKa values help to determine the isoelectric pH (also known as the isoelectric point, pI). The pI is the pH at which the substance has a charge of zero. It affects how the amino acid moves in gels of different pH values during electrophoresis.