Use this chemistry calculator to reproduce a named relationship with explicit quantities and units for study, laboratory planning, or an independent numerical check.

Kd

Required number input.

V_org/V_aq

Required number input.

Number of extractions

Required integer input.

Compute fraction remaining after n extractions. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Fraction remaining

The resulting fraction remaining returned as a number.

• The result is conditional on the stated model, constants, standard state, temperature, pressure, composition, and unit basis. Real mixtures and measurements can depart from ideal behavior and carry uncertainty not represented by a single calculated value.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check units and significant figures, compare the result with limiting cases, and use measured or source-specific constants where available. Laboratory, safety, and regulatory decisions require validated methods and appropriate uncertainty analysis.

• Buffer pH After Addition

  Compute the buffer pH after adding strong base as pKa plus log10 of conjugate base over remaining weak acid.

• Decay Remaining Calculator

  Compute the remaining amount after radioactive decay as N = N₀·(1/2)^(t/t½).

• Excess Reagent Moles Remaining Calculator

  Compute the moles of excess reagent left over after the limiting reagent is fully consumed.