3. *A very important indicator of the chemical
composition of water is the hydrogen ion
concentration? Water reaction – pH. Varies in the
range from 6.5 to 8.5. The reason for reducing the pH
to approx. 4 are acidic precipitation, the presence of
large amounts of humic acids and acidic wastewater
pollution. The increase in the concentration of OH ions
may be due to contamination with sewage water
alkaline and eutrophic waters of the effect of
intensive growth of algae consume carbon dioxide. In
this case the observed fluctuations in the pH value
during the day as a result of varying the intensity of
photosynthesis.
*
4. *In the liquid phase continuously formed and break
hydrogen bonds between water molecules. Water is
easy protonation and deprotonation of acids to form
a hydronium ion H3O +. Jon is also connected to
hydrogen bonds forming a Zundel cation H5O2 +,
H9O4 + Eigen cation and larger agglomerates. The
crystal structure of the hydrogen bonds are broken
and do not determine the crystallographic structure
of hexagonal water. When subjected to water
pressure of more than 3900 MPa, the water density
increases to about 1.5 g / cm³ and ice is formed at
a temperature above 0 ° C.
*
5. *Water - the compound of formula H 2 O
present at standard conditions in the liquid
state. The gaseous water is defined as water
vapor in the solid state - ice. Word of water as
a chemical name can refer to any state of
aggregation.
*
6. *Mineral water is water from a mineral spring
that contains various minerals, such as salts
and sulfur compounds. Mineral water may be
effervescent due to contained gases.
*
7. *Traditionally, mineral waters were used or
consumed at their spring sources, often
referred to as "taking the waters" or "taking the
cure," at developed cities such as spas, baths,
or wells. The term spa was used for a place
where the water was consumed and bathed in;
bath where the water was used primarily for
bathing, therapeutics, or recreation; and well
where the water was to be consumed.
*
8. *In modern times, it is far more common for
mineral water to be bottled at the source for
distributed consumption. Travelling to the
mineral water site for direct access to the
water is now uncommon, and in many cases
not possible (because of exclusive commercial
ownership rights). There are more than 3,000
brands of mineral water commercially available
worldwide.
*
