patel (rmp932) – Post-Lab 5 Acid/Base Titration – lyon – (51730) This print-out should have 25 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Answer the question to at least six significant figures. A solution of sodium hydroxide is standardized against potassium hydrogen phthalate (KHP‚ formula weight 204.2 g/mol). From the following data‚ calculate the molarity of the NaOH solution: mass of KHP 1.404 g; buret reading
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The fair restrain 1 mg/L of NAA along with 0.1 mg/L kinetin called EMMS1 medium showed results expect towards callus differentiation. The most important range in the field of plant muscle educate with proven practical applications is the sprout gift educate technique. Similarly if we simile 0.1+0.5 T & G medium with 0.1+0.1 T & G medium‚ it is observed that only by varying the concentration of phytohormones‚ they trifle some roles in somatic embryogenesis. inacanum becomes lush immature‚ hard‚ crumble
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3.13 Test for Saponin glycosides 2g of dried plant powder add 5ml of distill water shake vigorously. Persistent of foam indicate the presence of saponin glycosides. 3.14 Test for Steroids (Salkowski’s test) 5ml of test solution add with 2ml of Chloroform and then Conc. H2SO4 sides of the test tubes. The appearance of color at the interface indicates the presence of steroids. 3.15 Experimental Procedure for preliminary Phytochemical studies (Brindha et al.‚ 1981) S. No Name of the Test
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Name: Jocelyne Munguia|Date: 6/12/13| Exp 1: Observations of Chemical Changes|Lab Section: 75426| Data Tables: Part 1: |Chemicals|Well No.|Observations of the Reaction| A.|NaHCO3 + HCl|A2|Tiny bubbles formed around the edges. Under white paper it looked transparent‚ but under black paper there was some white in the middle. | B.|HCl + BTB|A3|The mixture turned yellow instantly. Under white paper the mixture was more of mustard yellow and under black paper it was less of a bright yellow. | C
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Yes A6 NaOH Sodium Hydroxide AhNO3 Silver Nitrate Turned Brown Yes B1 AgNO3 Silver Nitrate NH4OH Aqueous Ammonia Observation 1: Turned Cloudy Absorb in paper towel & expose to sunlight Observation 2: no reaction noted yes B2 NH4OH Aqueous Ammonia CuSO4 Copper Sulfate The reaction turned light blue Yes QUESTIONS Suppose a household product label says it contains sodium hydrogen carbonate (sodium bicarbonate). Using your results from Data Table 1 as a guide‚ how would you test this material
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SALTS AND THEIR PREPARATION SALTS A salt is a compound formed when the hydrogen ions in an acid are replaced by metal ions or by ammonium ions. Compounds in which the H+ ions in an acid have been replaced by ammonium ions (NH4+) are called ammonium salts. NOTE: •An anion is a negatively charged ion. Hence:•Hydrochloric acid gives chlorides. E.g. sodium chloride‚ ammonium chloride. •Nitric acid gives nitrates. E.g. barium nitrate‚ copper nitrate. •Sulphuric acid gives sulphates. E.g. silver sulphate
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= 14.007 u‚ atomic mass of O = 16.00 u) Solution: Atomic mass of K = 39.10 u (Given) Atomic mass of N = 14.007 u (Given) Atomic mass of O = 16.00 u (Given) Therefore‚ molar mass of potassium nitrate (KNO3) = 39.10 + 14.007 + 3(16.00) = 101.107 g Therefore‚ mass percent of oxygen in KNO3 = = 47.47% (approx) Empirical formula and molecular formula: Empirical formula Molecular formula Represents the simplest whole number ratio of various atoms present in a compound Represents the exact
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ICSE X | CHEMISTRY Board Paper – 2015 ICSE Board Class X Chemistry Board Paper – 2015 Time: 2 hrs Max. Marks: 80 Answers to this Paper must be written on the paper provided separately. You will not be allowed 10 write during the first 15 minutes. This time is to be spent in reading the Question Paper. The time given at the head of this paper is the time allowed for writing the answers. Section I is compulsory. Attempt any four questions from section II. The intended marks for questions or parts
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Atrazine (1-chloro-3-ethylamino-5-isopropylamino-2‚ 4‚ 6-triazine‚ CAS: 1912-24-9) was purchased from Dr. Ehrenstorfer GmbH (97.7%‚ Germany). Ethyl acetate (99.8%‚ ANPEL Scientific Instrument (Shanghai) Co.‚ Ltd.) was used as solvent for standard solutions. Acetonitrile used as HPLC eluent was purchased from ANPEL Scientific Instrument (Shanghai) Co.‚ Ltd.‚ KH2PO4·12H2O‚ K2HPO4·2H2O‚ dichloromethane and other chemical reagents used in cultivated media were purchased from Sinopharm Chemical Reagent
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(i) What did she observe after churning milk? (ii) What could be the possible reason for this observation? 2 11. The average atomic mass of a sample of an element ‘X’ is 16.2µ. What is the percentage of each isotope 16X and 18X in the sample? 2 8 8 12.Why does a wooden block float and an iron block sinks when both are placed
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