Unit 4A (Acids and Bases)
Coffee is a solution containing caffeine, acids, alkaloids, water, phenols, and many other
chemicals. The solvent in the coffee solution is __________ and the rest of the chemicals
dissolved in the solvent are called _________.
What is the difference between a saturated solution and a supersaturated solution?
12 eggs can be referred to as one dozen eggs.
______________ particles can be referred to as one mole of particles.
10 billion oxygen molecules (1 x 10
10
) is how many moles of molecular oxygen are there?
If the weights of carbon, hydrogen, and oxygen are approximately 12, 1, and 16 g/mol
respectively, about how much would 1 mole of sucrose (C6H12O6
) weigh?
The pH of a strong acid might be _____ while the pH of a strong base might be _____
The pH of pure water is _____.
What would be the pH of .002 moles of HNO3 dissolved in 2 L of water?
A base has a pH of 8.5. What is the concentration of OH
-
ions in the solution?
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I'll HELP you answer any of these but you need to tell me what you don't understand about each. Also, note that the question on possible pH for strong acids and strong bases mixes up the difference between strong acids/bases with concentration. ANY pH value correctly answers that question.
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Simple answer. You just want me to do your work for you.
Yes
The solvent in the coffee solution is water, and the rest of the chemicals dissolved in the solvent are called solutes.
A saturated solution is a solution where the maximum amount of solute has been dissolved at a given temperature and pressure. Any additional solute added will not dissolve and will remain as a solid at the bottom of the container.
A supersaturated solution is a solution where more solute has been dissolved than should theoretically be possible at a given temperature and pressure. This is achieved by dissolving a larger amount of solute in a solvent and then slowly cooling or evaporating the solution. The extra solute remains dissolved until disturbed, such as by adding a seed crystal or by agitating the solution, causing the excess solute to precipitate out.
Particles can be referred to as one mole of particles. A mole is a unit of measurement used in chemistry to represent a specific amount of a substance, equal to the number of particles (atoms, molecules, ions, or other entities) present in 12 grams of carbon-12 isotope. Avogadro's number, approximately 6.022 Ă— 10^23, represents the number of particles in one mole.
To find the number of moles of oxygen molecules, you need to divide the given number of molecules by Avogadro's number. Thus, 10 billion oxygen molecules (1 x 10^10) divided by Avogadro's number (approximately 6.022 Ă— 10^23) gives you the number of moles.
For example, (1 x 10^10) / (6.022 Ă— 10^23) = approximately 1.66 x 10^-14 moles of oxygen molecules.
To calculate the weight of 1 mole of sucrose (C6H12O6), you need to add up the atomic weights of the individual elements in the molecular formula. Carbon (C) has an atomic weight of 12 g/mol, hydrogen (H) has an atomic weight of 1 g/mol, and oxygen (O) has an atomic weight of 16 g/mol.
So, 6 moles of carbon (C) x 12 g/mol + 12 moles of hydrogen (H) x 1 g/mol + 6 moles of oxygen (O) x 16 g/mol = 72 g + 12 g + 96 g = 180 g/mol.
Therefore, one mole of sucrose (C6H12O6) weighs approximately 180 grams.
The pH scale is used to measure the acidity or alkalinity of a solution. A strong acid typically has a low pH, often less than 3. A strong base, on the other hand, has a high pH, often greater than 11.
The pH of pure water is 7, which is considered neutral.
To determine the pH of a solution of 0.002 moles of HNO3 dissolved in 2 L of water, you need to consider the dissociation of HNO3 into H+ ions. HNO3 is a strong acid, meaning it completely dissociates in water.
Since the coefficient of HNO3 is 1, there will be 0.002 moles of H+ ions produced. The concentration (Molarity) of the solution can be calculated by dividing the moles of solute by the volume of the solution.
So, the concentration of H+ ions will be 0.002 moles / 2 L = 0.001 M.
The pH scale is a logarithmic scale, so we can determine the pH using the equation pH = -log[H+]. Taking the logarithm of 0.001 gives you approximately 3. Thus, the pH of the solution is 3.
If a base has a pH of 8.5, you can use the equation pOH = 14 - pH to find the pOH value. In this case, the pOH will be 14 - 8.5 = 5.5.
To find the concentration of OH- ions in the solution, you can use the equation pOH = -log[OH-]. Taking the logarithm of 10^-5.5 gives you approximately 3.16 x 10^-6 M. Therefore, the concentration of OH- ions in the solution is approximately 3.16 x 10^-6 M.
Thank you for being honest. I'm happy to help anyone who wants to learn but I'm not interested in doing all of the work while someone else watches. I already know the answers so all I'm doing is helping you cheat if I GIVE you the answers with no work on your part. In the end that doesn't help you. #1 is
12 eggs can be referred to as one dozen eggs.
______6.02E23________ particles can be referred to as one mole of particles.