I know that you can mix a base and an acid to make a neutral but are there any pure substances that just have a PH of 7?(thats neutral by the way).
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The normal rate of acid excretion through the kidneys gives urine a pH that falls between 6.75 and 7.25.\nWhen your body has the mineral reserves that it should, the abundance of minerals will show up in a saliva ph test as a pH reading of 7.0 to 7.50.\nCheck out acid base balance on the Net to find more.
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1) Bi carbonate buffer system will contain HCO3- ion\n\nwhen a base is added it will liberate the H+ and produce water combining with OH- ion of the base there for reducing the effect of the base\n\nand when an acid is added it will accept the H+ ion and for H2CO3 therefor the effect of the acid will be nullified!!!\n\n2)phosphates are H2O4- or HPO42-\n\nand it will also have the functions as mentioned in the above!!\n\n3)proteins have an NH2 group and well as a COOH group both attached to the same molecule!!!\n\ntherefor when acid is added the NH2 group will neutralize it\n\nand when a base is added COOH group will neutralize it  reducing the alkalinity!\n\nthere for all these chemicals found in the blood and other body tissue will maintain the blood pH level at a constant level acting as natural buffers!!\n\nhope you understood!!!!!\n\ncheers!!
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pH is the measure of acidity or basicity(alkalinity) of a solution. When pH increases, the solution is more alkaline and when pH decreases the solution is more acidic. A pH of 7 implies that the solution is neither basic(alkaline) nor acidic but neutral. Check the answer to one of the similar questions on Yahoo answers at the following page.
429157
1.  F  acids have pH < 7\n2.  T\n3.  F  Cations are positive, anions are negative\n4.  T\n5.  F  Crystal lattices formed by ionic bonds\n6.  F  When atoms are "destroyed", the reaction is nuclear...molecular changes are chemical.\n7.  F  Metal elements donate electrons and form cations\n8.  F  Ion with + charge has lost electrons\n9.  F  prevent foods from reacting with oxygen.
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check this link-- http://www.orgsyn.org/orgsyn/prep.asp?prep=cv6p0468.\n\ninstead of Me use Ph
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acid\ngas naphtha\noxygen  and hydrogen\nacid\nacid
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The balanced equation is\n\nH3PO4 + 3KOH ----> K3PO4 + 3H2O\n\nApart from using the rule to balance this, you can also view this in this way, H3PO4, when dissolved in solution, gives 3H+ and 1PO43-, while KOH when dissolved in solution gives 1K+ and 1OH-. OH- and H+ always neutralize each other to give water. Therefore, you need 3 OH- to neutralize the 3H+ from the acid. Work out the balance, you get the above equation.\n\nGenerally, number of atom and particles can be found by first finding the number of moles. Number of moles by definition is the mass of the substance divided by the molecular weight. For example, total number of mole in 12 g of C is \n12 / 12 = 1 mole\n\nWithin each mole, there are always a finite number of UNIT, which can be in the form of atom, molecule, or ion. This special number is called the Avogadro constant, and has a value of 6.02e23.\n\nFor example, 1 mole of C has 6.02e23 carbon atom.\n\nHowever, for 1 mole of H2, there are 6.02e23 H2 MOLECULE!!! because every two H atoms are bond together to form a more stable molecule. To find the total number of atom, you know each H2 molecule has 2 atom, so the total number of atom in this case is 2*6.02e23 or 12.04e23 atom.\n\nUsing the relationship\n\n# mole = mass/ molecular weight\n\nYou get mass = # mole * molecular weight
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* Arrhenius acids and bases are the traditional acids and bases.  Simple examples of a weak acid is vinegar.  A weak base would be.. (the only thing that comes to mind is ammonia but it's not really the most safe thing and there should be weaker bases)\n\n* oxide  of an element = iron oxide or rust\n\n* weak organc acid - vinegar (acetic acid) would also qualify \n\n* compound composed of an alkali and a halogen = NaCl or table salt \n\n* solid product is calcium carbonate or chalk\n\n* polymer is PVC, most commonly found in piping/plumbing patio furniture, etc\n\n* substance with density greater than 1, anything that sinks in water like some kind of metal.
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d) basic\n\n[Non-metal oxides do the opposite and form acidic solutions if they are soluble e.g. sulphur dioxide dissolves to form sulphurous acid)
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Look up the chemical in a pKa ( -log of dissociation constant K)table of acids. H2PO4- has a pKa of 7.20. It is not very acidic.
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Anything from the periodic table is pure. these are all basic elements that can't be broken down into other elements. examples: hydrogen, nitrogen, iron, zinc and gold.\nclick here for the table: http://www.chem.qmul.ac.uk/iupac/AtWt/table.html
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This is the definition of a buffer.  It will control the pH against extreme changes.  If you add a small amount of strong acid, the weak base will neutralize it, bringing the pH back near the initial condition.  The reverse is true for adding strong base.
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if a soln is acidic it will be the OH anions which will be less.....for a soln 2 b acidic it has to hav H- ions...............
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<--------- 7 ---------->   (pH)\nacid                base\n\nthe smaller pH the stronger acid\nthe bigger pH the stronger base\n\nso you should arrange them from the smallest pH to the biggest\nstomach content (1.6)\nsoda pop (3)\nmilk (6.5)\nfresh water (7, of course neutral)\nhuman blood (7.4)\nsea water (8.7)\ndrain cleaner (8.7)
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the rule of thumb is "like dissolves like" \nWater is polar so if it dissolves a substance, that substance is also polar.
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Well first of all you have not given us all the information to be able to answer this buffer question.  We need to know the Ka (6.2x10-8)of the acid.  But the steps to perform the task.  Calculate how much of the acid is neutralized by the addition of the base.  Recalculate the equilibrium concentration of both the acid and base with the new acid value.  using Ka=[H+][Na2HPO4]/[NaH2PO4] solve for H+ and finally use pH=-log[H+].  Your final answer..pH=7.25
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In strongly acidic solutions, anions which are strong bases cannot be present to a great extent. These would include OH- or CH3COO-.\n\nIf the solution also contains silver ions, the halide ions (Cl-, Br- and I-) could not be there as well, because they would precipitate out with the silver.