Is breaking bonds endothermic or exothermic?
A quick way to remember this is BENDO MEX:
Breaking bonds is ENDOthermic = +ve enthalpy change
Making bonds is EXothermic = -ve enthalpy change
LS
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Sodium hydroxide reacts with phosphoric(V) acid according to the equation: 3NaOH + H3PO4 -> Na3PO4 + 3H2O 25.00 cm3 of 0.10 mol dm-3 sodium hydroxide reacts with 0.05 mol dm-3 H3PO4. The volume of H3PO4, in cm3, required for neutralisation is?
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