to accurately observe the effects of titration on an acid and a base? Hypothesis: 1.If we add 18 mL of titrant to the flask containing the vinegar and indicator (phenolphthalein)‚ then the endpoint of titration will be reached‚ causing the solution to turn pink. 2. If we add 14 mL of titrant to the flask containing HCI and the indicator (phenolphthalein)‚ then the endpoint of titration will be reached‚ causing the solution to turn colorless. II. Data Table 1: Acid or Base in household cleaner
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affect the volume of NaOH used to titrate the solutions by approximately 0.01ml. Moreover‚ it is not certain that the right amount of indicator was used for the titration of the unknown acid in trial 2. It is stated that 2 drops of indicator should be used. It was uncertain whether 1 drop or 2 drops were used. Another drop was added. Using the wrong amount of indicator‚ such as too much can shift the end point which tampers the results dramatically. Conclusion The objective of this lab
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sample‚ dissolve about ½- 2/3 of sample in about 10-15 mL DIW. pH Test Fill several vials with solution‚ and determine pH using indicators (starting with HBtB) pH 1.5: HSO4- must be present‚ and OH- must be absent pH about 2-2.5: SO42- may be present in mixture‚ but not in pure substance pH 3-3.5: OH- not present pH 5-6: NH4+ present pH 7: Cl-‚ NO3-‚ SO42-‚ K+‚ and/or Na+ could be present pH 9-10: HSO4- and NH4+ not present pH 13: OH- present and HSO4- and NH4+ not present K+ Test If NH4+
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Name: |Date:| Exp 1: Observations of Chemical Changes|Lab Section: | Data Tables: Part 1: |Chemicals|Well No.|Observations of the Reaction| A.|NaHCO3 + HCl| H12|White and bubbled slightly and settled down to smaller smaller bubbles| B.|HCl + BTB| H11|Golden yellow; looked darker under the black paper| C.|NH3 + BTB|H10 |Dark blue| D.|HCl + blue dye| H9|Greenish color| E.|Blue dye + NaOCl| H8|Blue and lighter than NH3+BTB solution color| | with the 1 drop of HCl| H8|Turned blue green
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application of Le Chatelier’s principle by observing the effects of acids and bases of on the solubility of Ca (OH) 2‚ the effects on Fe3+ and SCN- with Fe (SCN) 2+ to an equilibrium mixture. Also‚ finding the effects of an acid and base dealing with an indicator‚ and the effect on an acid on Ni2+‚ NH3‚ and Ni (NH3)62+. Data and Data Analysis: • Ca(OH)2 [pic] Ca2+ + 2 OH- Data: You will first add 6 drops of Ca( NO3)2 to a watch glass. Then add 6 drops of HCl then add 6 drops
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Reflection upon My Myers-Briggs Type Indicator – ENTJ Reflection upon Myers-Briggs Type Indicator - ENTJ 1 Reflection upon My Myers-Briggs Type Indicator – ENTJ 2 Reflection upon My Myers-Briggs Type Indicator - ENTJ The Myers-Briggs type indicator was developed by mother and daughter Isabel Myers and Katherine Briggs in order to help people understand the differences in human personalities. It is based on four preferences – Introversion vs. Extraversion‚ Intuition vs. Sensing‚ Thinking vs
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was determining the volume of a solution needed to react with a given mass or volume of a sample is called titration. The equivalence point is when the same number of moles of acid and moles of base has been added. Phenolphthalein is used as an indicator because it will have a color change when the equivalence point has been reached. Procedure See AP Chemistry. Chapter 4‚ Acid-Base Reactions‚ Titration Lab for procedure‚ or see worksheet. Data Standardization of Base with Solid Acid |
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Spectrophotometric determination of Ascorbic acid Concentration in an Unknown Solution Introduction: The naturally occurring organic compound with antioxidant properties is Ascorbic acid shortly referred as (AA). Normally the color of Ascorbic acid is white‚ but in some cases of impure samples it appears yellow in color. Ascorbic acid is solid in state. In water it dissolves well to give mildly acidic solutions. Ascorbic acid is one form ("vitamer") of vitamin C [1]. So‚ Ascorbic Acid (AA)
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Mixing of two solutions. 55 Class IX EXPERIMENT No: 9 AIM: To study the external features of root‚ stem‚ leaf and flower of monocot and dicot plants. Material Required : Plants of Hibiscus/Peturnia/rose/pea and grass/maize/bamboo/lily or‚ any other ornamental herb with flower and fruits‚ simple or dissecting microscope‚ hand lens‚ slide‚ coverslip and razor /blade. Procedure : 1. 2. 3. Observe the differences in the external features of stem‚ leaf‚ root‚ flowers and seeds. To study the leaf‚ see
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Environment Founded 1875 The Connecticut Agricultural Experiment Station Soil pH Experiment Gregory Bugbee Department of Environmental Sciences Michael Cavadini Department of Analytical Chemistry Introduction Soil pH affects the availability of nutrients to plants. pH is a measure of hydrogen ion concentration and ranges from 0 to 14. A pH of 7 is neutral while a pH below 7 is acidic and above 7 is alkaline. The pH scale is logarithmic with each unit 10 times more acidic or alkaline than the next
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