Organic chemistry calculators on iPhone

Mechanism problems get the attention. Lab write-ups still need molar mass, moles from mass, C₁V₁ = C₂V₂, percent yield, pH, and degree of unsaturation. Those should take seconds on your phone, not a paywall.

The calculations you actually repeat

Molar mass

Sum atomic masses from the molecular formula. Watch hydrates and parentheses: CuSO₄·5H₂O is not the same as CuSO₄.

Moles ↔ mass

n = m / M. In a synthesis, convert limiting reagent grams to moles before you talk about theoretical yield.

Dilution

C₁V₁ = C₂V₂. Keep units consistent (mL with mL, M with M). This shows up in extraction and workup as often as in general chemistry.

Percent yield

Percent yield = (actual / theoretical) × 100. Theoretical yield requires the limiting reagent, not “the mass of everything you mixed.”

Degree of unsaturation

For C_cH_hN_nO_x (halogens count as H, ignore O): DU = (2c + 2 + n − h) / 2. Each ring or π bond costs one degree; a triple bond costs two. Use it before you invent a structure from a formula.

pH

pH = −log[H⁺] for strong acids in the usual student approximation. Organic labs also care about pKa when choosing an extraction base — that is a lookup, not the same button as a pH calculator.

Step-by-step for a typical yield problem

1. Write balanced reaction and molar masses.
2. Convert each starting mass to moles; identify the limiting reagent.
3. Convert limiting moles to theoretical product mass.
4. Percent yield from the mass you actually isolated.

Useful tips

• Keep a formula reference next to the calculator. Twenty-six well-explained cards beat a random web search in lab.
• Do not use a homework-AI credit to compute molar mass.
• If DU is not an integer, the formula is wrong or you miscounted hydrogens/halogens.

Common mistakes

• Using the reagent in excess for theoretical yield.
• Forgetting that chlorine and bromine count as hydrogen in the DU formula.
• Reporting pH for a weak acid as if it fully dissociated.

How Organic Chemistry AI helps

The app includes 8 built-in calculators: molar mass, moles-mass, dilution, percent yield, and more, plus a live pH and degree-of-unsaturation explorer. A searchable set of 26 org-chem formulas sits in Formula Reference. Calculators and formulas are always free — they are not part of the 3-solve AI limit.

FAQ