what are isotonic solutions?
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The Answer is quite simple. Isotonic solutions are defined as two or more solutions having the same solute concentrations.
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a buffer solution is an aqueous solution of acids and salts of the acid that resist a change in pH.  If you didn't dilute the yeast in buffer, you would run the risk of killing the culture from build up of waste products.
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A solution that contains an equivalent amount of an acid and its conjugate base.
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Weak acids and organic acids in water.\n\nBut remember the solution depends on what the solvent is.  In water, the seven strong acids essentially completely ionize...i.e. can be considered completely ionized.
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Solute \n\nSolution \n\nSuspension or Mixture\n\nFiltration\n\nSolvent
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Sodium Hydroxide (aqueous). It's a solution in water of the compound NaOH.
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aqueous?\n\nany solute dissolved in water is then referred to as an aqueous solution. all acids are referred to as aqueous.\n\nex: HCl(aq) and NaCl(aq)
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The vinegar solution is hypotonic to the egg, the corn syrup is hypertonic to the egg and the water is isotonic. This is why the vinegar reacts with the egg (removes ions from it's shell) but the corn syrup and water will not.
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A solution with the same ionic concentration as a cell.  For example, PBS is a isotonic solution with respect to human cells.  Hypertonic is higher ionic concentration, hypotonic is lower ionic concentration.  hyptonic solns will lyse cells because of osmosis, water flows into the cells while solutes flow out of the cell, to reach equilibrium.  Thus cells will lyse in water without signficant amts of solvents.
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Isotonic exercises are generally good for weight loss. These are exercises that tone up your body by stressing mainly the heart and the lungs. They generally raise your body's metabolism and that helps you burn calories. Examples of isotonic exercises/sport include jogging, skipping, swimming, etc. Isometric exercises on the contrary increases specific muscles in size. It is mainly body builders who do this especially in the gym. Good luck on your weight loss program and don't forget to cut down on your calories as well!
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The word "solution" is synomynous with the phrase "homogeneous mixture," which means that it is uniform throughout.  When we say that coffee is a solution, we are saying that it is uniform throughout, which, for practical purposes, it is.
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buffer solution ?\nBuffer solution is  solution of which the pH does not change significantly on the addition of a little acid or base.\n\nBuffer are also important in many industrial processes.Certain processed food has to be prepared in a buffered form so that when consumed does not cuase undue changes in pH.
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It'd be basic speaking qualitatively. NH3 is a base so any amount in water would make the solution basic.
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C because the solution is SATURATED with solute, meaning no more solute can be dissolved by the solvent in the solution.
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I think you mean a salt SOLUTION.\n\nA solvent can dissolve things. Nail varnish remover is a solvent for nail varnish. Water can dissolve many things (but not nail varnish).\n\nThe thing that gets dissolved is called the solute; for example nail varnish.\n\nThe nail varnish remover dissolves the varnish to make a solution.\nSolvent (remover) + solute (varnish) = a solution.\n\nNow try it for water and salt to make a salt solution.
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Until the concentration of salt is large enough to form a saturated solution, ie. one in which no more solute will dissolve, the volume of the solvent (water) will not change.  20g of salt is not nearly enough to form a saturated solution, so the water level will remain at 500ml.
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I assume you mean mixtures like solutions where the components of each separate phase are distributed homogeneously (i.e. metal alloys, liquids, polymer blends) and the solution is at equilibrium.  \n\nPut simply, the main reason ternary (or binary or quaternary..) soltuions can remain separate has to do with the thermodynamics of the solution.  Under a given set of equilibrium conditions (temperature, pressure, etc.) different phases can form if they correspond to a minimum in what is called the free energy.  The free energy represents the balance between what are called enthalpic interactions (molecules/atoms interacting with each other or within themselves) and entropic contributions (the amount of disorder within the system).\n\nNote:  I've limitied my answer to a VERY rudimentary explanation.  There are other factors that determine whether phase separation actually occurs (i.e. kinetics).  I urge you to visit any of the many websites that can give a better explanation than I have given here.  For example, try to find links through www.acs.org.