quantity of solid dissolved in solution. It may also be used to calculate the molar mass of an unknown acid or base. Purpose: I. Prepare a standard solution of sodium hydroxide II. Standardize a sodium hydroxide solution by using potassium hydrogen phthalate (KHP) III. When given whether the acid is monoprotic‚ diprotic‚ or triprotic ‚ determine the molar mass of the unknown organic acid. IV. Calculate the Molarity of the Soft drink. Materials: * 50 mL Buret * Beaker
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Treatment of Depression Abstract Depression affects many people around the world. Depression can be described as feeling sad‚ lost‚ angry‚ and frustrated. Today‚ antidepressants are the main way to treat depression. Researchers are working on a new treatment to better help people with depression. This treatment is called Transcranial Magnetic Stimulation (TMS). Researchers want to know how TMS can be used‚ and what type of depression patients they want to use it on. Studies have helped narrow
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story‚ there’s several instances that point to the mother possibly being a victim of postpartum depression. Emily. Although the consequences of the mother’s choices have already taken effect‚ she can’t help but to think about what she could have done or what Emily could be if she’d made the “right” decisions‚ as deemed by then society’s standards. The setting takes place during a time of struggle and hopelessness in the United States‚ the Great Depression of the 1930’s. The birth of Emily‚ in
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Signs and Symptoms of Children with Depression July 25‚ 2012 Psychology 268 About 2.5% of children in the U.S. suffer from depression. Depression is significantly more common in boys under the age of 10. But by age 16‚ girls have a greater incidence of depression. Signs and symptoms of depression in children include: Irritability or anger. Continuous feelings of sadness and hopelessness. Social withdrawal. Increased sensitivity to rejection. Changes in appetite -- either increased
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The Effects of Acid Rain on Plant Growth PURPOSE The purpose of this experiment was to determine to what degree acid rain affects the growth of certain plants. I became interested in this idea because I’m worried about our environmental conditions and it sounded very interesting to me. The information gained from this experiment may be used to as a warning to stop air pollution. HYPOTHESIS My hypothesis is that the plant watered with the acid solution will grow more slowly than plant’s
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BUFFERS By: Luis P. Bazan‚ RPh.‚ Ph.D. A buffer solution is a solution of: 1. A weak acid or a weak base and 2. The salt of the weak acid or weak base Both must be present! A buffer solution has the ability to resist changes in pH upon the addition of small amounts of either acid or base. Consider an equal molar mixture of CH3COOH and CH3COONa CH3COOH (aq) H+ (aq) + CH3COO- (aq) Adding more acid creates a shift left IF enough acetate ions are present 16.3 Which of the following
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Aqueous Acid/Base Chemistry Resources: Harris ‘Quantitative Chemical Analysis’ Review: Pure water has a pH = 7 Autodissociation: H2O (( H3O+ + OH- K = [H3O+][OH-]/[H2O] -log[H3O+] = 7 [H3O+] = 10-7 M = [OH-] [H2O] = 55.56 M K = 1.8 x 10-16 ; pKa = 15.74 pKa is the acid dissociation constant; low pKa (strong acid‚ high pKa (weak acid we can also write Kw = [H3O+][OH-] Kw = 10-14 In water‚ pH + pOH = 14 pH scale Strong
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REPORT EXPERIMENT 9 CARBOXYLIC ACID AND DERIVATIVES Date: January 19‚ 2004 Objectives: 1. To understand the reactions of carboxylic compounds and derivatives. 2. To know the methods for preparing carboxylic acid derivatives. 3. To know the methods for testing the carboxylic acid derivatives. Experimental Procedures: 9.1 Solubility 1. Prepare 3 test tubes with 3 ml of water in each. 2. Place 3 drops of acetic acid‚ benzoic acid‚ and oxalic acid in separate test tubes. 3. Shake and observe
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Women and Depression Christina Eddy October 2012 Women and Depression WOMEN AND DEPRESSION Introduction A. What is causing more women to be depressed then men? B. Depression is one of the leading causes of death in women today. 2. Depression in women is caused by many different reasons a. Hormonal changes due to pre menopause and menopausal conditions. b. Women of all ages seem to suffer from depression at one time
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Name: Citric acid Chemical Name: 2-hydroxypropane-1‚2‚3-tricarboxylic acid Chemical Formula: C6H8O7 Chemical Structure: pH: 4.18‚ 3.90‚ 3.57 Classification: Weak acid Uses: It is a natural preservative/conservative and is also used to add an acidic or sour taste to foods and drinks. It is also used mainly as an acidifier‚ as a flavoring‚ and as a chelating agent. Name: Vinegar acid Chemical Name: Acetic acid or ethanoic acid Chemical Formula: C2H4O2 Chemical Structure:
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