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2. pH meter - Wikipedia

   en.wikipedia.org/wiki/PH_meter

   Beckman Model M pH Meter, 1937 [1] Beckman model 72 pH meter, 1960 781 pH/Ion Meter pH meter by Metrohm. A pH meter is a scientific instrument that measures the hydrogen-ion activity in water-based solutions, indicating its acidity or alkalinity expressed as pH. [2]

3. pH indicator - Wikipedia

   en.wikipedia.org/wiki/PH_indicator

   In and of themselves, pH indicators are usually weak acids or weak bases. The general reaction scheme of acidic pH indicators in aqueous solutions can be formulated as: HInd (aq) + H 2 O (l) ⇌ H 3 O + (aq) + Ind − (aq) where, "HInd" is the acidic form and "Ind −" is the conjugate base of the indicator. Vice versa for basic pH indicators ...

4. Total dissolved solids - Wikipedia

   en.wikipedia.org/wiki/Total_dissolved_solids

   When measuring water treated with water softeners, high levels of total dissolved solids do not correlate to hard water, as water softeners do not reduce TDS; rather, they replace magnesium and calcium ions, which cause hard water, with an equal charge of sodium or potassium ions, e.g. Ca 2+ ⇌ 2 Na +, leaving overall TDS unchanged [9] or even ...

5. Dadonov and Benn score as Stars beat Utah 2-1 for 3rd ...

   www.aol.com/dadonov-benn-score-stars-beat...

   Evgeni Dadonov and Jamie Benn each scored to help the Dallas Stars beat the Utah Hockey Club 2-1 on Monday night for their third straight win. Casey DeSmith stopped 34 shots for Dallas, which has ...

6. 13 Things You Should Never, Ever Carry in Your Wallet - AOL

   www.aol.com/finance/13-things-never-ever-carry...

   Go digital – your phone and the cloud are way safer. Related: Things You Should Never, Ever Carry In Your Purse. Joel Carillet/istockphoto. 9. Multiple Gift Cards.

7. Rico Carty, 15-year MLB vet and former batting champ with ...

   www.aol.com/rico-carty-15-mlb-vet-211359463.html

   Rico Carty, who played 15 seasons in the major leagues and won the 1970 National League batting title with the Atlanta Braves, has died at the age of 85.. A family friend confirmed to Listín ...