## General Chemistry |
## Calcium & Alkalinity |
## Salinity |
## Heating & Chilling |
## Reverse Osmosis |

## Equipment & Electrical |
## Water Change |
## Water Properties |
## Volume & Weight |
## Unit Conversion |

Estimate the amount of ammonium hydroxide solution required to reach a target ammonia level in an aquarium.

Estimate the equilibrium pH of an aquarium assuming it is thoroughly aerated.

Estimate the carbon dioxide (CO2) concentration given a few relevant parameters.

Estimate the free (un-ionized) ammonia (NH3) concentration given the total ammonia concentration.

Estimate the carbon dioxide (CO2) concentration given a few relevant parameters.

Estimate the maximum equilibrium oxygen (O2) concentration given a few relevant parameters.

Convert ammonia, nitrite, and nitrate concentrations between the -nitrogen and -ion forms.

Estimate the concentration of a sample using titration.

Estimate the total ammonia concentration given either the free ammonia (NH3) or ionized ammonia (NH4) concentrations

Estimate the imbalance of selected major ions in saltwater caused by the repeated dosing of two-part.

Estimate the contribution of a calcium reactor towards the calcium and alkalinity in an aquarium system.

Estimate the contribution of a calcium reactor towards the phosphate in an aquarium system.

Estimate the effluent flow rate and alkalinity level required from a calcium reactor to maintain target levels.

Estimate the necessary calcium, alkalinity, or magnesium additions required to reach a target level.

Estimate the contribution of a kalk solution towards the calcium and alkalinity of a system.

Estimate the amount of solid salt required to raise salinity to a target level.

Estimate the resulting change in salinity when water is added, evaporated, or replaced.

Given a true salinity, estimate the relative specific gravity (sg) that a non-temperature-correcting hydrometer will observe.

Estimate the amount of freshwater that must be added to a body of saltwater in order to reduce its salinity to a desired level.

Estimate the salinity of top-off water needed to increase overall tank salinity.

Correct a relative specific gravity (sg) measurement taken with a non-temperature-correcting hydrometer.

Estimate the drop in salinity of a system caused by the removal of saline skimmate.

Create a water-change schedule that can be used to reach a target salinity.

Plot the estimated change in aquarium temperature as a function of time in the event of a power failure.

Estimate the size (power) of heater and chiller required to maintain an aquarium within a specified temperature range.

Estimate what percentage of a deionization (DI) filter is being depleted by carbon dioxide (CO2) alone.

Estimate the actual rate of water production of a reverse-osmosis (RO) filter.

Estimate the rejection rate of a reverse-osmosis (RO) filter.

Estimate the electrical consumption of an aquarium system along with the associated cost.

Estimate the time needed for a higher-priced, but more energy-efficient piece of equipment to pay for itself.

Attempt to correct the pH reading of an uncalibrated, uncalibratable, or improperly calibrated digital pH meter.

Correct the reading of a pH meter that does not automatically correct for temperature.

Estimate the time required for a pump to process a specified percentage of an aquarium system's water.

Plot the estimated effect of repeated water changes on the concentration of a given substance.

Estimate the effective water change amount of several combined smaller water changes.

Estimate the concentrations of selected ions in natural seawater at a given salinity.

Estimate the density of water at a given temperature and salinity.

Estimate various properties of water at a given temperature and salinity.

Estimate the weight of a given volume of water at a specified temperature and salinity.

Estimate the volume and weight of substrate needed for a sand bed of a given height.

Estimate the volume of an aquarium system by performing a controlled salinity dilution.

This can be used for freshwater systems as well, if aquarium salts are utilized.

Estimate the volume of water different shapes of aquariums with sides of uniform thickness can hold.

Estimate both the full and empty weights of various shapes of aquariums with sides of uniform thickness.

Convert alkalinity between milliequivalents-per-liter (meq/L), carbonate hardness (KH, dKH), and parts-per-million (ppm).

Convert concentration between parts-per-million (ppm) and milligrams-per-liter (mg/L).

Convert between various units of flow rate (gallons-per-hour, milliliters-per-minute, and so on).

Convert salinity between parts-per-thousand (ppt), relative specific gravity (sg), and units of conductivity (mS/cm).

Convert temperature between fahrenheit (F), celsius/centigrade (C), and kelvin (K).

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