To begin the experiment‚ 8 ml of 0.1% Bromophenol blue (BPB) solution was made by diluting 0.25% BPB solution. From the 0.1% BPB solution‚ six diluted solutions‚ ranging from 1:50 to 1:10000‚ were prepared. Each solution was then run in the UV spectrophotometer to measure the absorbance at 590nm. DI water was used as a blank and samples were measured starting from the least concentrated one. The graph of concentration versus absorbance was plotted from the obtained data. In the second part‚ each
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saturated KHT solution. Several such solutions were prepared at various temperatures between 10°C and 50 °C‚ and filtrated into dry 250-mL conical flasks. For solutions made above or below the room temperature‚ their temperatures dropped or increased during filtrations. For each solution‚ two portion of 25.00±0.03 mL were pipetted into two 250-mL conical flasks and titrated with 0.07274 M of NaOH solution respectively with phenolphthalein as indicator. The temperatures of the KHT solutions and the corresponding
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the bottle. For about one minute the bottle was shaken. 3. The bottle was labeled with my name and set aside for a day. 4. Filter the contents of the bottle‚ into a dry conical flask. 5. Using a 10 cm3 pipette‚ transfer 10.0 cm3 calcium hydroxide solution to a conical flask‚ add a drop of phenolphthalein indicator and titrate against hydrochloric acid until the pink colour just disappears. 6. Perform three accurate titrations. 7. Record the temperature. Treatment of Results: Raw Data:
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The investigation was designed to determine the effect of the addition of increasing concentrations of a miscible liquid (ethanol) on the solubility of KNO3 in water. The results of the investigation support the hypothesis that water‚ which exhibits greater polarity‚ is able to dissolve a greater mass of KNO3 at lower temperatures compared to tested concentrations of Ethanol ranging from 12.5% to 30%. Furthermore‚ the results of the graph 1 show correspondence to the dielectric constant of each solvent
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The results over all groups were either over or under initial weight. To receive closer measurements a better salt wash to separate salt from sand would give more accurate results. Also a better straining method that doesn’t absorb some of the salt solution and trap sand would give more exact measurements of the individual components of the
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Effect of osmosis rate on different surface areas‚ depending on different types of water solution An investigation showing the effect of surface area on osmosis rate‚ including some different types of water concentration. Osmosis is a type of passive (not requiring energy) transport of water molecules across partially permeable membrane‚ from an area of high water concentration into area of low water concentration. But how does surface area affect rate of osmosis? Surface area plays important
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Abstract: The purpose of this experiment was to determine the concentration of an unknown amount of copper sulfate using the spectronic 20. Four solutions of different concentrations of H₂O and CuSO₄ were put into the spectronic 20 to observe their absorption of light. Then‚ a graph was created to plot down the measurements. Using the calibration curve of the graph‚ the concentration of the unknown substance was found out to be .12M. Background/Introduction: Beer’s law (which states that
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Answers to Questions Activity 1: Simulating Dialysis (Simple Diffusion) (pp. 2–4) 9. All solutes except albumin are able to diffuse into the right beaker. Using distilled water in the right beaker and either the 100 MWCO or 200 MWCO membrane will remove urea from the left beaker and leave albumin If the left beaker contains NaCl‚ urea‚ and albumin‚ you can selectively remove urea by dispensing a concentration of NaCl into the right beaker equivalent to that in the left beaker and by using
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Matter‚ Solutions‚ and Phase Changes Unit 1. What is matter? Anything that takes up space (volume) and has mass 2. Explain how to classify matter. (Homogeneous‚ Heterogeneous‚ Mixture‚ Pure Substance)? HOMOGENEOUS Matter that is made up of the same or alike particles Can’t see what makes it up Looks uniform HETEROGENEOUS Matter that is made up of different types of particles Can see what makes it up Mixture A material made up of two or more substances that can be easily separated
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