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🥖 City water and bread

Water carries geology into the mixing bowl. Follow hardness, calcium, magnesium, alkalinity and treatment into gluten, fermentation, loaf volume and the city-to-city bread myth.

4
lessons
~20 min
to learn
🔬 Science
subject
Adults
level
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What you’ll learn

  1. Where hardness comes fromExplain how rock, groundwater, treatment, and reporting conventions create water-hardness differences.Hardness mainly records dissolved calcium and magnesium, often supplied by carbonate rocks and reported as calcium carbonate equivalents.
  2. What the ions doDistinguish hardness, alkalinity, chlorine, and the roles of dissolved ions in dough and fermentation.Water hydrates flour and carries ions; calcium, magnesium, bicarbonate, and chlorine are different variables with different effects.
  3. Why dough noticesConnect water chemistry to gluten, fermentation, experimental evidence, and practical adjustments.Mineral profiles can shift dough behavior, but the result depends on flour, concentration, process, and the controls used in the comparison.
  4. Why cities differDesign a fair two-water bake and interpret city-to-city bread claims cautiously.Water can matter, especially at extremes, but reproducible measurements are needed to separate it from flour, yeast, temperature, and technique.

Questions this course answers

Which dissolved ions chiefly define water hardness?

Water hardness is generally reported from dissolved calcium and magnesium, often as calcium carbonate equivalents.

Match each water term to its best description.

These terms describe different properties that can all affect how a baker interprets tap water.

Put this controlled water comparison in a sensible order.

Control first, compare second, measure third, and refine the experiment only after observing the result.

What fraction of common bread dough is water by baker's percentage in a 75% hydration formula?

A 75% hydration dough uses 750 grams of water for every 1,000 grams of flour, before considering other water-containing ingredients.

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