Water For Coffee: a global survey of tap water chemistry
In an attempt to gain a higher resolution map of the world, we are seeking your input. Thus, we need you to input your geographical location where you sampled the water, and we also need the water measurements themselves.
There are only 5 questions. We really appreciate your continued support.
If you purchased Water For Coffee from us (waterforcoffeebook.com), what was your order number?
Orders numbers are formatted as either #1234 or WFC-1234-ED1. This helps us get an idea of the number of readers that ended up taking more than an educational interest in the topic. Feel free to leave blank if you want to remain anonymous!
Your answer
Please tell us where the tap water was measured. Please use the format detailed above. *
lease carefully input the data in the following format: (Post code if applicable), (City), (State or Territory), (Country) For example: 97401, Eugene, Oregon, USA
Your answer
Which titration kit did you use? *
Next we are interested in your water's composition. Specifically, we want to know the concentration of both bicarbonate and calcium/magnesium.

PLEASE READ CAREFULLY!
Red Sea Reef Foundation Pro Users
If you used the Red Sea kit, you are titrating the quantity of each ion as the ion itself, rather than the ion as CaCO3. Given that other kits use the "as CaCO3" nomenclature, we have elected to simplify the input here. For those who used the Red Sea kit, convert the Ca(2+) concentration to "as CaCO3" by multiplying by 2.5. For Mg(2+) multiply by 4.1. Add these values together, and enter these in the measured metal ion concentration section below.
For HCO3(-) please report the value you measured, divided by 1.2.

Youtube reference for Red Sea Reef Foundation Pro users:
https://www.youtube.com/watch?v=2D5RTrSZQ7s&t=201s


Other titration kit users
If you used a different titration kit, the units likely report in "as CaCO3". No further adjustment is required.
Please remember to convert the number of drops you added to a quantity of dissolved mineral, by multiplying by the number of drops by ~18.

What was your measured bicarbonate concentration? *
What was your measured metal ion concentration? *
If you have measured your water's total dissolved solids with an ionic conductivity probe, we'd also love to know that information. What was your 'total dissolved solids' measurement, as evidenced by the ionic conductivity measurement?
IC-TDS probes have found application when combined with titration techniques, as high ionic conductivity but low buffer typically indicates high levels of Cl(-).
Thank you for your input!
To the boundaries of science, Chris and Maxwell
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