what ions are responsible for hard water?
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Calcium(Ca+²) and Magnesium(Mg+²)
640052
looks like potassium chloride, Magnesium chloride, Sodium Nitrate, and Water... Is this what you are looking for?
312689
Lets use the example of salt again. NaCl. What happens is this. Both water molecules and salt molecules are ionized molecules. When salt is added to water, the ionic bond breaks apart as the positively charged Na is attracted to the negatively charged OH in the water and the negatively charged Cl is attracted to the positively charged H in the water.
776682
Because tap water contains ions like F- and Cl- which will interupt the process.
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http://hyperphysics.phy-astr.gsu.edu/hbase/chemical/water.html\n\nsee the picture here!
634552
an ion with both acidic and basic part
372176
Sounds like you've got too much time on your hands to me!  The ions in solution keep the water molecules farther apart from eachother on average than they would be in pure water.  Therefore the hydrogen bonds are weaker and the water will boil at a lower energy level.  At least that's what I'd guess.
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salt.\n\n(Sodium Chloride)
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Water has a density maxima at 4C
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Acids and bases, to release ions, must be in the presence of water. Acids give an H to the water to form H30+, hydronium, and bases grab an H from water to form OH-, hydroxide.
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Something that requires water in order to become a true Base\n\ne.g. CaO + H2O -> Ca(OH)2
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b) small fraction of the maximum number of possible hydronium ions, H3O+.\n\nHNO2 + H2O <===> H3O+ + NO2-
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I'll make it easy for you.All the metals forms positive ions by losing electrons and all non-metals form negative ions by gaining electrons.\nExample:- NaCl  Na+ & Cl-
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water's chemical description is H2O, one atom of oxygen bound to two atoms of hydrogen. \n\n1). Pure water has a neutral pH of 7, which is neither acidic nor basic.\n\n2). Water is called the "universal solvent" because it dissolves more substances than any other liquid.\n\n3). Water is unique in that it is the only natural substance that is found in all three states -- liquid, solid (ice), and gas (steam) -- at the temperatures normally found on Earth.\n\nTypes of water\nI). Hard & soft water\nSoft water - Any water that does not contain a significant amount of dissolved minerals such as salts of calcium or magnesium.\nHard Water - water containing a high level of calcium, magnesium, and other minerals. Hard water reduces the cleansing power of soap and produces scale in hot water lines and appliances.\n\nII). Ground water & Surface water\nGround water - In hydrologic terms, water within the earth that supplies wells and springs; water in the zone of saturation where all openings in rocks and soil are filled, the upper surface of which forms the water table. Also termed Phreatic water.\n\nSurface water - Precipitation which does not soak into the ground or return to the atmosphere by evaporation or transpiration, and is stored in streams, lakes, wetlands, and reservoirs is surface water.
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A water molecule contains two elements: hydrogen and oxygen. Both elements have different electronegativities, which is a fancy word meaning how well they can attract electrons. Since oxygen has a higher electronegativity, it forces the electrons of the water molecule toward itself, giving the oxygen element a slight negative charge and the hydrogen atoms slight positive charges.\nBasically speaking, water itself is somewhat charged. This makes water what is called a polar molecule and allows it to conduct electricity. This also accounts for how well water adheres to itself (cohesion).\nHowever, this polarity is relatively small.
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Water is 'hard' when it has a high content of dissolved calcium ions. A water softener normally replaces these calcium ions with sodium ions. So dissolved calcium carbonate which makes the water hard, is chemically changed into sodium carbonate, which does not make the water hard. The usual substance that is used is sodium zeolite, which can later be changed back from the calcium zeolite that it is changed into, by soaking it in a sodium chloride solution (salt solution), after which it can be used again.
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Sodium bicarbonate in solid form is a poor conductor.    However, it will ionize when dissolved in water and conduct electricity then.