Is there a difference when the needle or metal clip is placed on the surface of distilled water with dilute amounts of liquid detergent? Explain your observations in terms of the strength of IMFA present in each condition
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Is there a difference when the needle or metal clip is placed on the surface of distilled water with dilute amounts of liquid detergent? Explain your observations in terms of the strength of IMFA present in each condition.
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- Explain why a dispersion of silver nanoparticles coated with an amine functionalised polymer would be more stable at low pH than high pH.List and describe two methods that can used to improve the separation of a liquid mixture by fractional distillationDescribe the differences between a Stober procedure and a water/oil emulsion procedure for the synthesis of colloidal silica particles.
- (b) Suppose the laboratory Technician carried out the same titration experiment in which he/she recorded an average volume of 20 cm³ of the dilute hydrochloric acid (HC) by titrating with 0.05 mol dm³ and 25 cm³ of potassium hydroxide (KOH). Calculate the concentration of hydrochloric acid from the Technician's experiment.Describe the clinical effects of elevated concentrations ofsodium ions in the blood.25.0 cm3 of sodium hydroxide solution is tritrated against 0.2 mol dm–3 hydrochloric acid until the indicator just changes colour. 27.5 cm3 of the acid are required to reach the end point.Phenolphthalein is used as an indicator in the above experiment. What will be its colour change at the end point? From pink to yellow From pink to colourless From yellow to colourless From yellow to pink
- 11.(a) 10.06 cm3 of the stock 0.100 mol dm–3 solution of NaOH was required to fully neutralise 49.5 mg of a diprotic acid (H2A). Write a balanced equation for this reaction and hence determine the molar mass (Mr) of the acid. (b) Determine the pH of 0.100 mol dm–3 NaOH at 298 K [pKw = 14.0].The distribution coefficient of hydrogen sulfide between benzene and water at 25 degrees Celsius is 5.9880. What is the minimum volume of benzene at 25 degrees Celsius necessary to extract in a single step 80% of the hydrogen sulfide from 1 liter of 0.15 molar aqueous solution of hydrogen sulfide?a.) 0.1336b.) 23.9520c.) 0.6680d.) 1.5030E.) none of the aboveA 50-mL solution of 0.5005 N standard NaOH was added to a 0.9250-g sample of Aspirin and was boiled for 10 minutes. After cooling a full pipet of phenolphthalein was added to the solution before it was titrated with 24.7 mL of 0.5015 N standard HCl solution until the disappearance of the pink color. The same procedure was carried using a blank which consumed 4.6 mL of the same standard acid. Calculate for the %Aspirin in the sample. Atom weights: C =12, H =1, O =16.
- Write the chemical reaction for the incongruent dissolution of spodumene.Fatty acid-soap systems exhibit a minimum in surface tension as a function of pH. What causes the increase in surface tension with decrease in pH below the pH of minimum surface tension? Unionized fatty acid that is present in this region is less surface active Increase in the level of acid soap with decrease in pH results in increase surface tension Because of precipitation of unionized fatty acid in this region, the level of soluble surfactant decreases with decrease in pH Increase in ionic repulsion in the adsorbed layer with decrease in pH reduces surfactant adsorption at the interfaceSuka-tuba is a vinegar variety derived by fermenting the sap of a coconut tree. You are tasked to analyze its acetic acid Describe the preparation of 5.0 M NaOH stock solution from analytical grade NaOH pellets. Describe the preparation of 0.10 M NaOH solution from the stock solution. How much KHP was used per trial. (purity KHP: 99.0%).