What is the ph of a koh solution that has [h+] = 1. 87 × 10–13 m? round to the nearest tenth. what is the poh of a koh solution that has [oh–] = 5. 81 ×10–3m? round to the nearest hundredth. what is the ph of a solution of nacl that has [h+] = 1. 00 × 10–7 m? round to the nearest hundredth.